1.0Mathematical Sciences/mathKatie/math/author/wehrheikuwm-edu/rich600338<blockquote class="wp-embedded-content" data-secret="jGU0gaFjql"><a href="/math/event/alastair-fletcher/">Colloquium: Prof. Alastair Fletcher</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="/math/event/alastair-fletcher/embed/#?secret=jGU0gaFjql" width="600" height="338" title="“Colloquium: Prof. Alastair Fletcher” — Mathematical Sciences" data-secret="jGU0gaFjql" 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> Infinitesimal Spaces of Quasiregular Mappings Prof. Alastair Fletcher Professor of Mathematical Sciences and Director of Undergraduate Studies Northern Illinois University How can we differentiate functions which are not differentiable? In the context of quasiregular mappings, a generalization of holomorphic functions …/math/wp-content/uploads/sites/112/2025/01/FLETCHER_BANNER.jpg984504