1.0Mathematical Sciences/mathloeschm2@uwm.edu/math/author/loeschm2uwm-edu/rich600338<blockquote class="wp-embedded-content" data-secret="piUM9BbjiM"><a href="/math/event/colloquium-dr-rafael-s-gonzalez-dleon/">Colloquium: Dr. Rafael S. González D’León</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="/math/event/colloquium-dr-rafael-s-gonzalez-dleon/embed/#?secret=piUM9BbjiM" width="600" height="338" title="“Colloquium: Dr. Rafael S. González D’León” — Mathematical Sciences" data-secret="piUM9BbjiM" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script type="text/javascript"> /* <![CDATA[ */ /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); //# sourceURL=/math/wp-includes/js/wp-embed.min.js /* ]]> */ </script> On Whitney numbers of the first and second kind, or is it the other way around? Dr. Rafael S. González D’León Assistant Professor  Loyola University Chicago Algebraic combinatorics is centered on the idea that a variety of algebraic objects can …/math/wp-content/uploads/sites/112/2024/08/BANNER_RAFAEL.png