BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Mathematical Sciences - ECPv6.15.18//NONSGML v1.0//EN CALSCALE:GREGORIAN METHOD:PUBLISH X-ORIGINAL-URL:/math X-WR-CALDESC:Events for Mathematical Sciences REFRESH-INTERVAL;VALUE=DURATION:PT1H X-Robots-Tag:noindex X-PUBLISHED-TTL:PT1H BEGIN:VTIMEZONE TZID:America/Chicago BEGIN:DAYLIGHT TZOFFSETFROM:-0600 TZOFFSETTO:-0500 TZNAME:CDT DTSTART:20230312T080000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0500 TZOFFSETTO:-0600 TZNAME:CST DTSTART:20231105T070000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:-0600 TZOFFSETTO:-0500 TZNAME:CDT DTSTART:20240310T080000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0500 TZOFFSETTO:-0600 TZNAME:CST DTSTART:20241103T070000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:-0600 TZOFFSETTO:-0500 TZNAME:CDT DTSTART:20250309T080000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0500 TZOFFSETTO:-0600 TZNAME:CST DTSTART:20251102T070000 END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTART;TZID=America/Chicago:20240502T130000 DTEND;TZID=America/Chicago:20240502T150000 DTSTAMP:20260422T174250 CREATED:20240411T204638Z LAST-MODIFIED:20240429T133426Z UID:10016155-1714654800-1714662000@uwm.edu SUMMARY:PhD Dissertation Defense: Mr. Russell Latterman DESCRIPTION:Bayesian Change Point Detection In Segmented Multi-Group Autoregressive Moving-Average Data For The Study Of COVID-19 In Wisconsin\nMr. Russell Latterman\nUniversity of Wisconsin-Milwaukee \nChangepoint detection involves the discovery of abrupt fluctuations in population dynamics over time. We take a Bayesian approach to estimating points in time at which the parameters of an autoregressive moving average (ARMA) change\, applying a Markov Chain Monte Carlo method. We specifically assume that data may originate from one of two groups. We provide estimates of all multi-group parameters of a model of this form for both simulated and real-world data sets. We include a provision to resolve the problem of confounding ARMA parameter estimates and variance of segment data. We apply our model to identify events that may have contributed to the 2020 and 2021 outbreaks of COVID-19 in Waukesha County\, Wisconsin. \nAdvisor: Prof. David Spade \nCommittee Members:\nProfs. Richard Stockbridge\, Istvan Lauko\, Chao Zhu\, and Vytaras Brazauskas URL:/math/event/phd-dissertation-defense-mr-russell-latterman/ LOCATION:EMS Building\, Room E424A\, E424A; 3200 N Cramer St.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Graduate Student Defenses ORGANIZER;CN="The Department of Mathematical Sciences":MAILTO:math-staff@uwm.edu X-TRIBE-STATUS: GEO:43.0758771;-87.8858312 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=EMS Building Room E424A E424A; 3200 N Cramer St. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=E424A; 3200 N Cramer St.:geo:-87.8858312,43.0758771 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20240502T160000 DTEND;TZID=America/Chicago:20240502T170000 DTSTAMP:20260422T174250 CREATED:20240425T191913Z LAST-MODIFIED:20240425T192108Z UID:10016160-1714665600-1714669200@uwm.edu SUMMARY:MS Thesis Defense: Mr. Lucas Fellmeth DESCRIPTION:Utilizing ARMA Models for Non-Independent Replications of Point Processes\nMr. Lucas Fellmeth\nUniversity of Wisconsin-Milwaukee \nThe use of a functional principal component analysis (FPCA) approach for estimating intensity functions from prior work allows us to obtain component scores of replicated point processes under the assumption of independent replications. We show these component scores can be modeled using classical autoregressive moving average (ARMA) models\, thus allowing us to also apply the FPCA model to non-independent replications. The Divvy bike-sharing system in the city of Chicago is showcased as an application. \nAdvisor: Prof. Daniel Gervini \nCommittee Members:\nProfs. Daniel Gervini\, David Spade\, and Chudamani Poudyal URL:/math/event/ms-thesis-defense-mr-lucas-fellmeth/ LOCATION:EMS Building\, E408\, 3200 N Cramer St\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Graduate Student Defenses ORGANIZER;CN="The Department of Mathematical Sciences":MAILTO:math-staff@uwm.edu X-TRIBE-STATUS: GEO:43.075931;-87.885538 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=EMS Building E408 3200 N Cramer St Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=3200 N Cramer St:geo:-87.885538,43.075931 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20240503T083000 DTEND;TZID=America/Chicago:20240503T090000 DTSTAMP:20260422T174250 CREATED:20240425T192401Z LAST-MODIFIED:20240425T192401Z UID:10016161-1714725000-1714726800@uwm.edu SUMMARY:MS Thesis Defense: Mr. Sven Bergmann DESCRIPTION:Adding a Third Normal to CLUBB\nMr. Sven Bergmann\nUniversity of Wisconsin-Milwaukee \nThe Cloud Layers Unified By Binormals (CLUBB) model uses the sum of two normal probability density function (pdf) components to represent subgrid variability within a single grid layer of an atmospheric model. This binormal approach\, while computationally efficient\, restricts the model’s ability to capture the full spectrum of potential shapes encountered in real-world atmospheric data. This thesis proposes to introduce a third normal pdf component strategically positioned between the existing two\, significantly enhancing the model’s representational flexibility. This trinormal representation allows for a wider range of grid-layer shapes while permitting analytic solutions for certain higher order moments. The core of this work lies in deriving the necessary mathematical transformations for incorporating the third normal pdf seamlessly into the CLUBB framework. This thesis lists all formulas\, inputs\, and outputs associated with the extended model as well as gives an outline\non how to check those equations. Additionally\, it describes certain asymptotic behavior of the trinormal pdf under various parameter settings. \nAdvisor: Prof. Vince Larson \nCommittee Members:\nProfs. Vince Larson\, Peter Hinow\, and David Spade URL:/math/event/ms-thesis-defense-mr-sven-bergmann/ LOCATION:EMS Building\, EMS E495\, 3200 Cramer St\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Graduate Student Defenses ORGANIZER;CN="The Department of Mathematical Sciences":MAILTO:math-staff@uwm.edu X-TRIBE-STATUS: END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20240503T133000 DTEND;TZID=America/Chicago:20240503T140000 DTSTAMP:20260422T174250 CREATED:20240411T204952Z LAST-MODIFIED:20240429T181640Z UID:10016156-1714743000-1714744800@uwm.edu SUMMARY:PhD Dissertation Defense: Mr. Dan Noelck DESCRIPTION:Contraction Rates For McKean-Vlassov Stochastic Differential Equations\nMr. Dan Noelck\nUniversity of Wisconsin-Milwaukee \nThis work focuses on the contraction rates for McKean-Vlasov stochastic differential equations (SDEs)\, McKean-Vlasov Stochastic differential delay equations (SDDEs)\, and path dependent McKean-Vlasov stochastic differential equations.\nUnder suitable conditions on the coefficients of the SDE\, this dissertation derives explicit quantitative contraction rates for the convergence in Wasserstein distances of McKean-Vlasov SDEs using the coupling method. The contraction results are then used to prove a propagation of chaos uniformly in time\, which\nprovides quantitative bounds on convergence rate of interacting particle systems\, and establishes exponential ergodicity for McKean-Vlasov SDEs. The dissertation further develops suitable conditions on the coefficients of the McKean-Vlasov SDDE to obtain a contraction in Wasserstein distance using the coupling method again. These results are used to establish exponential ergodicity for McKean-Vlasov SDDEs. Last the dissertation obtains suitable conditions on the coefficients of the path dependent McKean-Vlasov SDE for a contraction in Wasserstein distance. \nAdvisor: Prof. Chao Zhu \nCommittee Members:\nProfs. Lijing Sun\, Jeb Willenbring\, Richard Stockbridge\, and Peter Hinow URL:/math/event/phd-dissertation-defense-mr-dan-noelck/ LOCATION:EMS Building\, Room E423\, E423; 3200 N Cramer St\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Graduate Student Defenses ORGANIZER;CN="The Department of Mathematical Sciences":MAILTO:math-staff@uwm.edu X-TRIBE-STATUS: GEO:43.0758771;-87.8858312 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=EMS Building Room E423 E423; 3200 N Cramer St Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=E423; 3200 N Cramer St:geo:-87.8858312,43.0758771 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20240503T140000 DTEND;TZID=America/Chicago:20240503T153000 DTSTAMP:20260422T174250 CREATED:20240422T130711Z LAST-MODIFIED:20240422T131628Z UID:10016158-1714744800-1714750200@uwm.edu SUMMARY:Colloquium: Prof. Genevieve Walsh DESCRIPTION:Hyperbolic groups\, their boundaries and drilling\nProf. Genevieve Walsh\nProfessor of Mathematics\nTufts University \nWe will define and describe groups with a particular geometry\, hyperbolic groups. We will define the boundary of a hyperbolic group and give many examples. If time permits\, we will define a drilling of a hyperbolic group and explore how this operation changes the boundary. Any new work is joint with Groves\, Haissinsky\, Manning\, Osajda and Sisto. URL:/math/event/colloquium-prof-genevieve-walsh/ LOCATION:EMS Building\, EMS E495\, 3200 Cramer St\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Colloquia ORGANIZER;CN="The Department of Mathematical Sciences":MAILTO:math-staff@uwm.edu X-TRIBE-STATUS: END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20240506T130000 DTEND;TZID=America/Chicago:20240506T140000 DTSTAMP:20260422T174250 CREATED:20240506T153439Z LAST-MODIFIED:20240506T153439Z UID:10016163-1715000400-1715004000@uwm.edu SUMMARY:MS Thesis Defense: Mr. Silas Winnemoeller DESCRIPTION:A Finite Element Block Modified Backward Euler Method For Solving A One-Dimensional Poisson-Nernst-Planck Ion Channel Model\nMr. Silas Winnemoeller\nUniversity of Wisconsin-Milwaukee \nIn this thesis\, a finite element block modified backward Euler method is introduced to solve a one-dimensional Poisson-Nernst-Planck ion channel (1D PNPic) model. This model is defined as a system of time-dependent nonlinear partial differential equations\, called Poisson-Nernst equations and Poisson equation\, describing the transport of charged ionic species across a cell membrane via an ion channel pore. For an electrolyte with n ionic species\, its numerical solution gives a prediction to n ionic concentration functions and an electrostatic potential function. However\, solving the 1DPNPic model numerically is challenging due to the model’s strong nonlinearity and numerical stability issues. To address the numerical stability issues\, the traditional backward Euler implicit time scheme is often selected to solve the 1DPNPic model but it may be too costly to be practical in application since it has to solve a system of n + 1 strongly nonlinear partial differential equations at each time step. Hence\, its modification becomes necessary to reduce its computing cost while retaining its numerical stability properly. In this thesis\, the new method is constructed by semi-discretization and finite element techniques such that its each time iteration only involves calculation within two blocks with each block only containing two linear differential equations. Consequently\, the new method can reduce the\ncomputing cost of the Euler scheme sharply. In this thesis\, the new method is implemented as a software package in Python based on the finite element library from the FEniCS project. Numerical tests are then done for an electrolyte with two ionic species\, demonstrating the convergence and high performance of the new method. \nAdvisor: Prof. Dexuan Xie \nCommittee Members:\nProfs. Lei Wang\, Vincent Larson\, and Dexuan Xie \n  URL:/math/event/ms-thesis-defense-mr-silas-winnemoeller/ LOCATION:EMS Building\, Room E416\, 3200 N Cramer St\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Graduate Student Defenses ORGANIZER;CN="The Department of Mathematical Sciences":MAILTO:math-staff@uwm.edu X-TRIBE-STATUS: GEO:43.075931;-87.885538 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=EMS Building Room E416 3200 N Cramer St Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=3200 N Cramer St:geo:-87.885538,43.075931 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20240906T123000 DTEND;TZID=America/Chicago:20240906T133000 DTSTAMP:20260422T174250 CREATED:20240903T132255Z LAST-MODIFIED:20240903T132340Z UID:10016175-1725625800-1725629400@uwm.edu SUMMARY:Graduate Student Colloquium: Melissa Beerbower DESCRIPTION:On the Lucky Sets of Fubini Rankings\nMelissa Beerbower\nLoyola University Chicago \nRecall that Fubini rankings of length n are rankings of n competitors allowing for ties. We can say that the number of rankings\, k\, with k less than or equal to n\, is equal to the number of lucky competitors. A lucky competitor is the first to attain its rank. We enumerate Fubini rankings recursively through fixed sets of lucky competitors. Also recall that unit Fubini rankings are Fubini rankings with at most two competitors for each rank. We enumerate unit Fubini rankings through fixed lucky sets. Our enumerations explain twin coefficients for minimum powers in the lucky polynomial of ell-interval Fubini rankings. URL:/math/event/graduate-student-colloquium-melissa-beerbower/ LOCATION:EMS Building\, Room E495\, E495; 3200 N Cramer St.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Graduate Student Colloquia ORGANIZER;CN="The Department of Mathematical Sciences":MAILTO:math-staff@uwm.edu X-TRIBE-STATUS: GEO:43.0758771;-87.8858312 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=EMS Building Room E495 E495; 3200 N Cramer St. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=E495; 3200 N Cramer St.:geo:-87.8858312,43.0758771 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20240906T140000 DTEND;TZID=America/Chicago:20240906T153000 DTSTAMP:20260422T174250 CREATED:20240826T192017Z LAST-MODIFIED:20240828T152606Z UID:10016166-1725631200-1725636600@uwm.edu SUMMARY:Colloquium: Dr. Rafael S. González D'León DESCRIPTION:On Whitney numbers of the first and second kind\, or is it the other way around?\nDr. Rafael S. González D’León\nAssistant Professor \nLoyola University Chicago \nAlgebraic combinatorics is centered on the idea that a variety of algebraic objects can be understood using the tools from combinatorics. In this talk\, I will illustrate this idea using a modern example of how combinatorial theories can give us a better understanding on a subject. The story I will tell involves the Whitney numbers of the first and second kind\, which are a pair of invariants of partially ordered sets (posets) that are relevant in several areas of mathematics. One of their most interesting appearances is as the coefficients of a polynomial enumerating proper colorings of a graph (think of colorings of a map where neighboring countries must be distinguishable from each other). They also appear counting regions in the complement of a real hyperplane arrangement. \nI will introduce and give insight into the algebraic and combinatorial objects in this story and share a very curious phenomenon: sometimes the Whitney numbers of the first and second kind of a poset are also the Whitney numbers of the second and first kind\, but of a different poset. Some recent results about this phenomenon could shed light on longstanding questions in the subject. URL:/math/event/colloquium-dr-rafael-s-gonzalez-dleon/ LOCATION:EMS Building\, E495\, 3200 N Cramer St\, Milwaukee\, WI\, United States CATEGORIES:Colloquia X-TRIBE-STATUS: END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20240913T123000 DTEND;TZID=America/Chicago:20240913T133000 DTSTAMP:20260422T174250 CREATED:20240911T143551Z LAST-MODIFIED:20240911T143551Z UID:10016178-1726230600-1726234200@uwm.edu SUMMARY:Community of Practice Kickoff Event DESCRIPTION:Do you like to talk about teaching? Do you like to socialize with other people in the department? Do you like pear bread? Do you have nothing better to do on a Friday afternoon? \nBring your thoughts:\nHave you done something cool in your class that you’d love to share with others?\nDo you have something you’d like to try in your class?\nWould you like to learn about cool things to do in your class? \nCome join us for the first event of the Math Community of Practice! We’ll have snacks! URL:/math/event/community-of-practice-kickoff-event/ LOCATION:EMS Building\, EMS E495\, 3200 Cramer St\, Milwaukee\, WI\, 53211\, United States ORGANIZER;CN="The Department of Mathematical Sciences":MAILTO:math-staff@uwm.edu X-TRIBE-STATUS: END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20240913T140000 DTEND;TZID=America/Chicago:20240913T153000 DTSTAMP:20260422T174250 CREATED:20240823T155120Z LAST-MODIFIED:20240827T182002Z UID:10016165-1726236000-1726241400@uwm.edu SUMMARY:Colloquium: Prof. Laurel Ohm DESCRIPTION:PDE Problems in Thin Filament Hydrodynamics\nProf. Laurel Ohm\nAssistant Professor of Mathematics\nUniversity of Wisconsin-Madison \nMany fundamental biophysical processes\, from cell division to cellular motility\, involve dynamics of thin structures immersed in a very viscous fluid. Various popular models have been developed to describe this fluid-structure interaction mathematically\, but much of our understanding of these models is at the level of numerics and formal asymptotics. Here we will discuss some of the interesting issues that arise in developing the PDE theory of thin filament hydrodynamics\, as well as the insights this analysis perspective can shed on the underlying biophysics. URL:/math/event/colloquium-prof-laurel-ohm/ LOCATION:EMS Building\, EMS E495\, 3200 Cramer St\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Colloquia ORGANIZER;CN="The Department of Mathematical Sciences":MAILTO:math-staff@uwm.edu X-TRIBE-STATUS: END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20240920T123000 DTEND;TZID=America/Chicago:20240920T133000 DTSTAMP:20260422T174250 CREATED:20240917T155920Z LAST-MODIFIED:20240917T155920Z UID:10016179-1726835400-1726839000@uwm.edu SUMMARY:Graduate Student Colloquium: Joe Paulson DESCRIPTION:Introduction to (Partial) Z-Boundaries\nJoe Paulson\nPhD Graduate Student\nUniversity of Wisconsin – Milwaukee \nIn this talk\, I’ll share an abridged story of Z-boundaries and their utility in group theory. Throughout\, we’ll revisit some main characters (compactifications\, homotopy groups\, group actions) and introduce some new ones (group boundaries\, shape invariance). As our story seemingly resolves\, we’ll adapt and refocus on a theory of partial Z-boundaries (ie. Z_n-boundaries) and identify some preliminary results. URL:/math/event/graduate-student-colloquium-joe-paulson/ LOCATION:EMS Building\, Room E495\, E495; 3200 N Cramer St.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Graduate Student Colloquia ORGANIZER;CN="The Department of Mathematical Sciences":MAILTO:math-staff@uwm.edu X-TRIBE-STATUS: GEO:43.0758771;-87.8858312 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=EMS Building Room E495 E495; 3200 N Cramer St. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=E495; 3200 N Cramer St.:geo:-87.8858312,43.0758771 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20240920T140000 DTEND;TZID=America/Chicago:20240920T153000 DTSTAMP:20260422T174250 CREATED:20240826T192058Z LAST-MODIFIED:20240828T152515Z UID:10016167-1726840800-1726846200@uwm.edu SUMMARY:Colloquium: Prof. Bob Eisenberg DESCRIPTION:Ion Channels\, the Ultimate Multiscale Device\nProf. Bob Eisenberg\nProfessor of Biomathematics and Physiology\nDepartment of Physiology & Biophysics\, Rush University\, Chicago IL \nProteins called ion channels are the ultimate multiscale device\, the ‘nanovalves of life’ controlling most biological functions the way transistors control computers. A handful of atoms control biological function on the macroscale\, so analysis must link atomic distances of 10-10m with biological distances of 1 meter. Channels are of such biological and medical importance that hundreds of scientists study them every day and thousands of talks on channels are given at (for example) the annual meeting of the Biophysical Society (USA). Channels conduct ions (spherical charges like Na+ \, K+ \, Ca2+ \, and Cl- with diameter ~ 0.2 nm) through a narrow tunnel of permanent charge (‘doping’) with diameter ~ 0.6 nm. Channels can be studied in the tradition of physical science. PNP equations familiar in physics form an adequate initial model of current voltage relations in many types of channels under many conditions\, and can be extended to describe ‘chemical’ phenomena like selectivity with some success. Variational models and methods are needed to deal with the coupling of different fields. Ionic channels are studied with the powerful techniques of molecular biology. Atoms (and thus charges) can be substituted a few at a time and the location of every atom can be determined in favorable cases. Ion channels are one of the few living systems of great importance where natural biological function can be well described by a tractable set of equations. Mathematics and mathematicians are needed to apply these equations to the hundreds of channels of biological and clinical significance. URL:/math/event/colloquium-bob-eisenberg/ LOCATION:EMS Building\, E495\, 3200 N Cramer St\, Milwaukee\, WI\, United States CATEGORIES:Colloquia X-TRIBE-STATUS: END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20240927T123000 DTEND;TZID=America/Chicago:20240927T133000 DTSTAMP:20260422T174250 CREATED:20240924T180747Z LAST-MODIFIED:20240924T185718Z UID:10016180-1727440200-1727443800@uwm.edu SUMMARY:Graduate Student Colloquium: Alexander Moon DESCRIPTION:Kohnert Properties of Northeast Diagrams\nAlexander Moon\nGraduate Student\nUniversity of Wisconsin – Milwaukee \nKohnert polynomials and posets are combinatorial objects with deep representation theoretic meaning\, generalizing both Schubert polynomials and Demazure characters\, i.e.\, key polynomials. In this talk I will explore what Kohnert posets and polynomials are in general\, then I will discuss some recent results centering on the Kohnert properties of “northeast” diagrams. I will present some conditions for the boundedness and rankedness of a “northeast” Kohnert poset and present a surprising connection between certain minimal elements and key diagrams. There will be a worksheet. This is a joint work with Aram Bingham\, Beth Anne Castellano\, Kimberly Hadaway\, Reuven Hodges\, Yichen Ma\, and Kyle Salois that originated at this year’s GRWC. URL:/math/event/graduate-student-colloquium-alexander-moon/ LOCATION:EMS Building\, Room E495\, E495; 3200 N Cramer St.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Graduate Student Colloquia ORGANIZER;CN="The Department of Mathematical Sciences":MAILTO:math-staff@uwm.edu X-TRIBE-STATUS: GEO:43.0758771;-87.8858312 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=EMS Building Room E495 E495; 3200 N Cramer St. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=E495; 3200 N Cramer St.:geo:-87.8858312,43.0758771 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20241004T123000 DTEND;TZID=America/Chicago:20241004T133000 DTSTAMP:20260422T174250 CREATED:20240925T143928Z LAST-MODIFIED:20240925T143928Z UID:10016181-1728045000-1728048600@uwm.edu SUMMARY:Graduate Student Colloquium: Jillian Cervantes DESCRIPTION:(t\,r) Broadcast Domination of the Truncated Square Tiling Graph\nJillian Cervantes\nGraduate Student\nUniversity of Wisconsin – Milwaukee \nThis talk will introduce graph domination theory and a generalization called (t\,r) broadcast domination. We study a family of graphs that arise as a finite subgraph of the truncated square tiling\, which utilizes regular squares and octagons to tile the Euclidean plane. For positive integers m and n\, we let Hm\,n be the graph consisting of m rows of n octagons (cycle graph on 8 vertices). For all t ≥ 2\, we provide lower and upper bounds for the (t\, 1) broadcast domination number for Hm\,n for all m\, n ≥ 1. We give exact (2\, 1) broadcast domination numbers for Hm\,n when (m\, n) ∈ {(1\, 1)\, (1\, 2)\, (1\, 3)\, (1\, 4)\, (2\, 2)}. We also consider the infinite truncated square tiling\, and we provide constructions of infinite (t\, r) broadcasts for (t\, r) ∈ {(2\, 1)\, (2\, 2)\, (3\, 1)\, (3\, 2)\, (3\, 3)\, (4\, 1)}. Using these constructions we give upper bounds on the density of these broadcasts i.e.\, the proportion of vertices needed to (t\, r) broadcast dominate this infinite graph. We end with some directions for future study URL:/math/event/graduate-student-colloquium-jillian-cervantes/ LOCATION:EMS Building\, Room E495\, E495; 3200 N Cramer St.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Graduate Student Colloquia ORGANIZER;CN="The Department of Mathematical Sciences":MAILTO:math-staff@uwm.edu X-TRIBE-STATUS: GEO:43.0758771;-87.8858312 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=EMS Building Room E495 E495; 3200 N Cramer St. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=E495; 3200 N Cramer St.:geo:-87.8858312,43.0758771 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20241004T140000 DTEND;TZID=America/Chicago:20241004T153000 DTSTAMP:20260422T174250 CREATED:20240826T192136Z LAST-MODIFIED:20240828T152858Z UID:10016168-1728050400-1728055800@uwm.edu SUMMARY:Colloquium: Dr. Zhaosheng Feng DESCRIPTION:Parabolic System of Aggregation Formation in Bacterial Colonies\nDr. Zhaosheng Feng\nEndowed Chair Professor of Mathematics\nUniversity of Texas Rio Grande Valley \nThe goal of this talk is to study a fourth-order nonlinear parabolic system with dispersion for describing bacterial aggregation. Analytical solution of traveling wave is found by taking into account the dispersion coefficient. Numerically\, we demonstrate that the initial concentration of bacteria in the form of a random distribution over time transforms into a periodic wave\, followed by a transition to a stationary solitary wave without dispersion. URL:/math/event/colloquium-zhaosheng-feng/ LOCATION:EMS Building\, E495\, 3200 N Cramer St\, Milwaukee\, WI\, United States CATEGORIES:Colloquia X-TRIBE-STATUS: END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20241011T123000 DTEND;TZID=America/Chicago:20241011T133000 DTSTAMP:20260422T174250 CREATED:20241008T163200Z LAST-MODIFIED:20241008T163200Z UID:10016184-1728649800-1728653400@uwm.edu SUMMARY:Graduate Student Colloquium: Kelsey Brouwer DESCRIPTION:Combinatorial Models for Some Generalized McMullen Maps in the Case of Two Bounded Critical Orbits\nKelsey Brouwer\nPhD Student\nUniversity of Wisconsin – Milwaukee \nThe family of generalized McMullen maps R(z)= z^n + b + a/z^n has two independent critical orbits. We consider the case in which one critical value lies in the immediate basin of an attracting cycle and the other critical value eventually lands in that immediate basin. Computer-generated images of the dynamical plane suggest the presence of both baby quadratic Julia sets and some sets which appear to be modifications of those. We present combinatorial models of the dynamics which help to explain this phenomena. URL:/math/event/graduate-student-colloquium-kelsey-brouwer/ LOCATION:EMS Building\, Room E495\, E495; 3200 N Cramer St.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Graduate Student Colloquia ORGANIZER;CN="The Department of Mathematical Sciences":MAILTO:math-staff@uwm.edu X-TRIBE-STATUS: GEO:43.0758771;-87.8858312 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=EMS Building Room E495 E495; 3200 N Cramer St. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=E495; 3200 N Cramer St.:geo:-87.8858312,43.0758771 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20241011T140000 DTEND;TZID=America/Chicago:20241011T153000 DTSTAMP:20260422T174250 CREATED:20241001T133357Z LAST-MODIFIED:20241001T133417Z UID:10016182-1728655200-1728660600@uwm.edu SUMMARY:Colloquium: Dr. Daniel Stoertz DESCRIPTION:Baby Mandelbrot Sets for Maximally Generalized McMullen Maps\nDr. Daniel Stoertz\nVisiting Assistant Professor of Mathematics\nSt. Olaf College \nIn Complex Dynamics\, we study the iteration of holomorphic or meromorphic functions on the complex plane or the Riemann sphere. Of particular interest is the behavior of the critical orbits of function families with one or more parameters. The simplest of such families\, z^2 +c\, is well-known to define the famous Mandelbrot set fractal as the set of c-values for which the unique critical orbit is bounded. In this talk we will examine the function family R(z) = z^n +b +a/(z^d)\, and we will explore old and new results establishing the location of baby Mandelbrot sets in parameter space for increasingly general versions of this family. In the most general case\, which we call maximally generalized McMullen maps\, this family has multiple independent critical orbits\, and the dynamics in this case are not yet well understood. URL:/math/event/colloquium-dr-daniel-stoertz/ LOCATION:EMS Building\, E495\, 3200 N Cramer St\, Milwaukee\, WI\, United States CATEGORIES:Colloquia X-TRIBE-STATUS: END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20241018 DTEND;VALUE=DATE:20241020 DTSTAMP:20260422T174250 CREATED:20240629T204300Z LAST-MODIFIED:20241008T132858Z UID:10016164-1729209600-1729382399@uwm.edu SUMMARY:ICMA-IX DESCRIPTION:  \n \nInternational Conference on Mathematical Modeling and Analysis of Populations in Biological Systems \nThe broad\, general theme of the conference is the formulation\, validation\, analysis and simulation of mathematical models for the spatiotemporal dynamics of biological populations. A special emphasis at this ninth conference will be placed on multiple scale dynamics in ecology\, epidemiology\, and systems biology; many biological systems operate on multiple spatial and temporal scales and the incorporation of these scales may be essential for capturing system dynamics. Specific topics include\, but are not limited to: \n\nImmuno-epidemiological and vector-host systems\nMolecular-cellular modeling in systems biology and oncology\nBiological invasions and persistence\nAdaption and evolutionary dynamics\nBiological systems operating on multiple spacial or temporal scales\n\nICMA-IX aims to accomplish at least three broad tasks: scientific progress\, scientific collaboration\, and the training of a future generation of mathematical biologists. The conference will thus have a significant impact\, both nationally and internationally\, on future research in biomathematics and mathematical biology. The collaborative opportunities provided to researchers at all points of the career path from undergraduate and graduate students\, to early-career faculty\, to established senior researchers will establish new directions and avenues for the national and international research community. \nHosts: \nPeter Hinow\nProfessor\nEMS\, E491\nhinow@uwm.edu \nGabriella Pinter\nProfessor\nEMS\, E479\ngapinter@uwm.edu URL:/math/event/icma-ix/ X-TRIBE-STATUS: END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20241018T123000 DTEND;TZID=America/Chicago:20241018T133000 DTSTAMP:20260422T174250 CREATED:20241008T150918Z LAST-MODIFIED:20241008T150918Z UID:10016183-1729254600-1729258200@uwm.edu SUMMARY:Graduate Student Colloquium: Gregory Mwamba DESCRIPTION:Blowup of the Nonlinear Klein-Gordon Equation in FLRW Spacetimes\nGregory Mwamba\nGraduate Student\nUniversity of California – Merced \nThe nonlinear Klein-Gordon equations are a class of important evolution equations that describe the movement of spinless relativistic particles\, which can lend understanding in many physical applications. In this talk we will demonstrate a sufficient condition for blowup of the nonlinear Klein-Gordon equation\, with arbitrarily positive initial energy in Friedmann-Lemaître-Robertson-Walker spacetimes. This is accomplished using an established concavity method that has been employed for similar PDEs in Minkowski space. This proof relies on the energy inequality associated with this equation. \nThis talk will be online at the following zoom link: https://wisconsin-edu.zoom.us/j/94983351854 and will also be streamed in EMS E495. URL:/math/event/graduate-student-colloquium-gregory-mwamba/ LOCATION:EMS Building\, Room E495\, E495; 3200 N Cramer St.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Graduate Student Colloquia ORGANIZER;CN="The Department of Mathematical Sciences":MAILTO:math-staff@uwm.edu X-TRIBE-STATUS: GEO:43.0758771;-87.8858312 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=EMS Building Room E495 E495; 3200 N Cramer St. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=E495; 3200 N Cramer St.:geo:-87.8858312,43.0758771 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20241018T140000 DTEND;TZID=America/Chicago:20241018T153000 DTSTAMP:20260422T174250 CREATED:20240826T192205Z LAST-MODIFIED:20241008T153529Z UID:10016169-1729260000-1729265400@uwm.edu SUMMARY:Colloquium: Prof. Qingshuo Song DESCRIPTION:Long-Time Behaviors of Stochastic Linear-Quadratic Optimal Control Problems\nProf. Qingshuo Song\nAssociate professor\nWorcester Polytechnic Institute \nIn this talk\, we will discuss the asymptotic behavior of the solution to a linear-quadratic stochastic optimal control problems. By establishing a connection between the ergodic cost problem and the so-called cell problem in the homogenization of Hamilton-Jacobi equations\, we reveal the turnpike properties of the linear-quadratic stochastic optimal control problems from various perspectives. URL:/math/event/colloquium-qingshuo-song/ CATEGORIES:Colloquia X-TRIBE-STATUS: END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20241024T160000 DTEND;TZID=America/Chicago:20241024T170000 DTSTAMP:20260422T174250 CREATED:20241022T134734Z LAST-MODIFIED:20241022T134734Z UID:10016188-1729785600-1729789200@uwm.edu SUMMARY:Math Club Meets: Dr. Kevin A. Palencia Infante DESCRIPTION:Math Club Meets: Dr. Kevin A. Palencia Infante\n51 Math Club students are invited to meet with Dr. Kevin A. Palencia Infante an Assistant Professor and Calculus Coordinator at Northern Illinois University (NIU). He is part of the Creating Opportunities in Mathematics through Equity and Inclusion (COME-IN) project under Transforming Post-Secondary Education in Mathematics (TPSEMath)\, where he serves as a DEI consultant. Over the next two years\, he will work together with our Math department with the purpose of enhancing efforts to broaden participation and inclusion. In this role\, he will provide an external perspective\, drawing on his experience and background to support the department through the implementation of its plan. \n  URL:/math/event/math-club-meets-dr-kevin-a-palencia-infante/ LOCATION:EMS Building\, E495\, 3200 N Cramer St\, Milwaukee\, WI\, United States CATEGORIES:Department Meetings X-TRIBE-STATUS: END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20241025T113000 DTEND;TZID=America/Chicago:20241025T123000 DTSTAMP:20260422T174250 CREATED:20241022T134415Z LAST-MODIFIED:20241022T134415Z UID:10016187-1729855800-1729859400@uwm.edu SUMMARY:Graduate Students Meet: Dr. Kevin A. Palencia Infante DESCRIPTION:Graduate Students Meet: Dr. Kevin A. Palencia Infante\n51 Math Graduate students are invited to meet with Dr. Kevin A. Palencia Infante an Assistant Professor and Calculus Coordinator at Northern Illinois University (NIU). He is part of the Creating Opportunities in Mathematics through Equity and Inclusion (COME-IN) project under Transforming Post-Secondary Education in Mathematics (TPSEMath)\, where he serves as a DEI consultant. Over the next two years\, he will work together with our Math department with the purpose of enhancing efforts to broaden participation and inclusion. In this role\, he will provide an external perspective\, drawing on his experience and background to support the department through the implementation of its plan. \n  URL:/math/event/graduate-students-meet-dr-kevin-a-palencia-infante/ LOCATION:EMS Building\, E495\, 3200 N Cramer St\, Milwaukee\, WI\, United States CATEGORIES:Department Meetings X-TRIBE-STATUS: END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20241025T123000 DTEND;TZID=America/Chicago:20241025T133000 DTSTAMP:20260422T174250 CREATED:20241022T133753Z LAST-MODIFIED:20241022T133753Z UID:10016185-1729859400-1729863000@uwm.edu SUMMARY:Community of Practice Meeting DESCRIPTION:Community of Practice: Broaden Participation and Inclusion via the TPSE COME-IN Project\nKevin A. Palencia Infante is an Assistant Professor and Calculus Coordinator at Northern Illinois University (NIU). He is part of the Creating Opportunities in Mathematics through Equity and Inclusion (COME-IN) project under Transforming Post-Secondary Education in Mathematics (TPSEMath)\, where he serves as a DEI consultant. Over the next two years\, he will work together with the University of Wisconsin-Milwaukee’s math department with the purpose of enhancing efforts to broaden participation and inclusion. This event is envisioned partly as a listening session for Dr Palencia Infante to learn about the successes and struggles of our teaching faculty and partly as a discussion and conversation where he can share best practices as an experienced Faculty Teaching Mentor. During his visit he will meet all constituents of our department: undergraduate and graduate students\, teaching faculty and faculty. This session provides an opportunity for our teaching faculty to share their experiences with him. URL:/math/event/community-of-practice-meeting/ LOCATION:EMS Building\, E495\, 3200 N Cramer St\, Milwaukee\, WI\, United States CATEGORIES:Department Meetings X-TRIBE-STATUS: END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20241025T140000 DTEND;TZID=America/Chicago:20241025T150000 DTSTAMP:20260422T174250 CREATED:20241022T134016Z LAST-MODIFIED:20241022T141907Z UID:10016186-1729864800-1729868400@uwm.edu SUMMARY:Math Department Town Hall DESCRIPTION:Town Hall\n\n\n\nOur department is engaged in a two-year project “Creating Opportunities in Mathematics through Equity & Inclusion (COME-IN)” through the professional organization Transforming Post Secondary Education in Mathematics (TPSE). Our consultant\, Dr. Kevin Palencia Infante\, is visiting our department from Northern Illinois University and he will work together with our math department with the purpose of enhancing efforts to broaden participation and inclusion. In this role\, he will provide an external perspective\, drawing on his experience and background to support the department in shaping and implementing its plan. In this Town Hall we will provide a short “State of our Department” and introduce the COME-IN project and our initial plans. \nSpeakers will include Craig Guilbault\, Suzanne Boyd\, Jeb Willenbring and Gabriella Pinter. We aim for a lively discussion with our audience through a question/answer session. URL:/math/event/math-department-town-hall/ LOCATION:EMS Building\, E495\, 3200 N Cramer St\, Milwaukee\, WI\, United States CATEGORIES:Department Meetings X-TRIBE-STATUS: END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20241101T123000 DTEND;TZID=America/Chicago:20241101T133000 DTSTAMP:20260422T174250 CREATED:20241022T141444Z LAST-MODIFIED:20241022T144645Z UID:10016189-1730464200-1730467800@uwm.edu SUMMARY:Graduate Student Colloquium: Kim Harry DESCRIPTION:A q-analog of Kostant’s Weight Multiplicity Formula and a Product of Fibonacci Numbers\nKim Harry\nPhD Graduate Student\nUniversity of Wisconsin-Milwaukee \nUsing Kostant’s weight multiplicity formula\, we describe and enumerate the terms contributing a nonzero value to the multiplicity of a positive root µ in the adjoint representation of sl_{r+1}(C)\, which we denote L(˜α)\, where ˜α is the highest root of sl_{r+1}(C). We prove that the number of terms contributing a nonzero value to the multiplicity of the positive root µ = α_i + α_i+1 + · · · + α_j with 1 ≤ i ≤ j ≤ r in L(˜α) is given by the product F_i · F_(r−j+1)\, where F_n is the nth Fibonacci number. Using this result\, we show that the q-multiplicity of the positive root µ = α_i + α_i+1 + · · · + α_j with 1 ≤ i ≤ j ≤ r in the representation L(˜α) is precisely q^{r−h(µ)}\, where h(µ) = j − i + 1 is the height of the positive root µ. Setting q = 1 recovers the known result that the multiplicity of a positive root in the adjoint representation of sl_{r+1}(C). URL:/math/event/graduate-student-colloquium-kim-harry/ LOCATION:EMS Building\, Room E495\, E495; 3200 N Cramer St.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Graduate Student Colloquia ORGANIZER;CN="The Department of Mathematical Sciences":MAILTO:math-staff@uwm.edu X-TRIBE-STATUS: GEO:43.0758771;-87.8858312 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=EMS Building Room E495 E495; 3200 N Cramer St. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=E495; 3200 N Cramer St.:geo:-87.8858312,43.0758771 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20241101T140000 DTEND;TZID=America/Chicago:20241101T153000 DTSTAMP:20260422T174250 CREATED:20240826T192228Z LAST-MODIFIED:20241025T170950Z UID:10016170-1730469600-1730475000@uwm.edu SUMMARY:Colloquium: aBa Mbirika & Morgan Fiebig DESCRIPTION:A graphical approach to the Fibonacci sequence (Fn) n≥0 modulo m extended to the Lucas sequences (Un(p\,q))n≥0 and (Vn(P\,q))n≥0\naBa Mbirika & Morgan Fiebig\nUniversity of Wisconsin – Eau Claire \nThe goal of this talk is twofold: (1) extend theory on statistics in the Fibonacci and Lucas sequences modulo m to the Lucas sequences U :=(Un(p\,q))n≥0 and V :=(Vn(p\,q)n 0\, and (2) apply this theory to a novel graphical approach of U and V modulo m. The statistics we explore are the period π(m)\, entry point e(m)\, and order ω(m) := pi(m)/e(m). We generalize a wealth of known Fibonacci and Lucas statistical results to the U and V setting. Based on ω(m)\, we describe behaviors shared by infinite families of nondegenerate U and V sequences with parameters q = ± 1. In our graphical approach we place the cycle of repeating terms of the periods of U and V in a circle\, and patterns which would otherwise be overlooked emerge. In particular\, we exhibit some tantalizing examples in the following three sequence pairs: Fibonacci and Lucas\, Pell and associated Pell\, and\, balancing and Lucas-balancing. Our proofs utilize results from primary sources ranging from the ground-breaking papers of Lucas in 1878 and Carmichael in 1913\, to the seminal works of Wall in 1960 and Vinson in 1963\, amongst others. URL:/math/event/colloquium-aba-mbirika/ CATEGORIES:Colloquia X-TRIBE-STATUS: END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20241115T123000 DTEND;TZID=America/Chicago:20241115T133000 DTSTAMP:20260422T174250 CREATED:20241113T152405Z LAST-MODIFIED:20241113T164702Z UID:10016191-1731673800-1731677400@uwm.edu SUMMARY:Graduate Student Colloquium: Eric Redmon DESCRIPTION:Finite State Machines and Bounded Permutations\nEric Redmon\nGraduate Student\nMarquette University \nWe define a k-bounded permutation π of length n to be a permutation such that for each pair of adjacent entries $\pi$ and $\pi(i + 1)$ for $i = 1\, 2\, 3\, . . . \, n − 1$ we have $|\pi(i) − \pi(i + 1)| \leq k$. Previous work has shown that the generating function for this family of permutations is rational\, and has computed generating functions for small values of $k$. In this talk\, we will discuss the nature of finite state machines and how we can leverage the insertion encoding devised by Albert\, Linton\, and Ruškuc to build a finite state machine that we can use to find generating functions for larger values of $k$. URL:/math/event/graduate-student-colloquium-eric-redmon/ LOCATION:EMS Building\, Room E495\, E495; 3200 N Cramer St.\, Milwaukee\, WI\, 53211\, United States CATEGORIES:Graduate Student Colloquia ORGANIZER;CN="The Department of Mathematical Sciences":MAILTO:math-staff@uwm.edu X-TRIBE-STATUS: GEO:43.0758771;-87.8858312 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=EMS Building Room E495 E495; 3200 N Cramer St. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=E495; 3200 N Cramer St.:geo:-87.8858312,43.0758771 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20241115T140000 DTEND;TZID=America/Chicago:20241115T153000 DTSTAMP:20260422T174250 CREATED:20240826T192945Z LAST-MODIFIED:20241029T133524Z UID:10016171-1731679200-1731684600@uwm.edu SUMMARY:Colloquium: Dr. Lei Hua DESCRIPTION:Unified Tail Dependence Measures and Its Applications in High-Frequency Financial Data\nDr. Lei Hua\nAssociate Professor\, Director of Statistical Consulting Service\nNorthern Illinois University \nIn this presentation\, I will first motivate the necessity for a unified tail dependence measure\, followed by an examination of the theoretical framework for developing such measures utilizing random variables characterized by regularly varying tails. Specific instances that result in unified tail dependence measures applicable in practical scenarios will be demonstrated. Ultimately\, I will explore the application of the unified tail dependence measure in the analysis of high-frequency financial market data and discuss novel empirical insights from financial markets. URL:/math/event/colloquium-nick-mayers/ CATEGORIES:Colloquia X-TRIBE-STATUS: END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20241122T123000 DTEND;TZID=America/Chicago:20241122T133000 DTSTAMP:20260422T174250 CREATED:20241030T170149Z LAST-MODIFIED:20241119T221438Z UID:10016190-1732278600-1732282200@uwm.edu SUMMARY:Colloquium: Nick Mayers DESCRIPTION:  \nWell-Behaved Kohnert Posets\nDr. Nicholas Mayers\nPostdoctoral Research Scholar\nNorth Carolina State University \nKohnert polynomials form a family of polynomials indexed by diagrams that consist of unit cells arranged in the first quadrant. Many families of well-known polynomials have been shown to be examples of Kohnert polynomials\, including key\, Schur\, and Schubert polynomials. Given a diagram D\, the monomials occurring in the corresponding Kohnert polynomial encode diagrams formed from D by applying sequences of certain moves\, called “Kohnert moves\,” each of which alters the position of at most one cell. In this talk\, we focus on the underlying sets of diagrams which generate the monomials of Kohnert polynomials. With each such collection of diagrams\, one can associate a poset structure which is known to not\, in general\, be well-behaved. In particular\, the corresponding “Kohnert posets” generally do not have a unique minimal element\, are not ranked\, and are not lattices. Here\, we will focus on recent attempts to find conditions under which Kohnert posets are well-behaved in the sense that they have a unique minimal element\, are ranked\, or are EL-Shellable. No background knowledge concerning posets is assumed. URL:/math/event/colloquium-nick-mayers-2/ LOCATION:EMS Building\, E495\, 3200 N Cramer St\, Milwaukee\, WI\, United States CATEGORIES:Colloquia X-TRIBE-STATUS: END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Chicago:20241206T123000 DTEND;TZID=America/Chicago:20241206T133000 DTSTAMP:20260422T174250 CREATED:20241203T162313Z LAST-MODIFIED:20241203T162405Z UID:10016193-1733488200-1733491800@uwm.edu SUMMARY:Graduate Student Colloquium: Math Graduate Student Panel DESCRIPTION:Graduate Student Colloquium: Math Graduate Student Panel\nThis is our last Math Graduate Student Colloquium of the semester. We will have a panel of senior graduate students happy to discuss our experiences here in 51’s math department and answer any questions you might have. This can range from department life\, teaching\, research\, and more. Please come and join us in the conversation and bring any topics you would like to talk about or questions you might have. URL:/math/event/graduate-student-colloquium-math-graduate-student-panel/ LOCATION:EMS Building\, E495\, 3200 N Cramer St\, Milwaukee\, WI\, United States X-TRIBE-STATUS: END:VEVENT END:VCALENDAR