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SUMMARY:Graduate Student Colloquium: Ariel Minakawa and Gavin Sayrs
DESCRIPTION:Stirling Permutations to Increasing Plane Trees and Back\nAriel Minakawa and Gavin Sayrs\nUndergraduate Students\nUniversity of Wisconsin-Milwaukee \nA Stirling permutation is a permutation on the multiset {1\,1\, 2\, 2\, 3\, 3\, … \,n\, n} such that any numbers appearing between repeated values of i must be greater than i. Recall that a plane tree is a tree drawn on a plane with no edges crossing. An increasing plane tree is a plane tree where each vertex is labeled from 1 to n\, with labels increasing away from the root. Our main result establishes a bijection from Stirling permutations to its respective increasing plain tree.
URL:/math/event/graduate-student-colloquium-ariel-quinn-and-gavin-sayrs/
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
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SUMMARY:Colloquium: Prof. Shamgar Gurevich
DESCRIPTION:How you think on a function defined on 0\,1\,…\,N-1?\nProf. Shamgar Gurevich\nProfessor of Mathematics\nUniversity of Wisconsin-Madison \nBetween thousand to million times per day\, your cellphone calculates the Fourier Transform (FT) of certain functions defined on 0\,1\,…\,N-1\, with N large (order of magnitude of thousands and more). The calculation is done using the Fast Fourier Transform (FFT) – discovered by Cooley–Tukey in 1965 and by Gauss in 1805. \nIn the lecture I want to advertise a beautiful way—due to Auslander-Tolimieri—to obtain the FFT as a natural consequence of an answer to the following: \nQUESTION: How to think on the space of functions on the set 0\,1\,…\,N-1? \nEngineers tell us that there are two answers for this question: \n(A) as functions on that set\, where 0\,1\,…\,N-1 regarded as times; \nand\, \n(B) as functions on that set\, where 0\,1\,…\,N-1 regarded frequencies; \nand then the FT is an operator translating between the two spaces. \nIn the lecture\, I will explain that there is another answer\, i.e.\, a not so well-known third space (C)\, of arithmetic nature\, that also gives an answer to the above question\, and then the FFT appears simply as the composition of two operators:\nthe one translating between spaces (A) and (C)\, and the one that translates (C) to (B). \nRemark: The lecture is prepared to be understood to anyone who is familiar with basic linear algebra. In particular\, advanced undergraduate students\, from computer science\, engineering\, mathematics\, physics\, etc\, are more than welcome to attend.
URL:/math/event/colloquium-prof-shamgar-gurevich/
LOCATION:EMS Building\, E495\, 3200 N Cramer St\, Milwaukee\, WI\, United States
CATEGORIES:Colloquia
ORGANIZER;CN="The Department of Mathematical Sciences":MAILTO:math-staff@uwm.edu
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