What is … Ext and its applications?

This page hosts information on Hannah Enders's talk "What is … Ext and its applications?" at the "What is …?" seminar. The talk will take place on Friday, July 13, 4pm at HU, RUD 25 1.023.

Abstract

From the module of homomorphisms Hom(M,N) between two modules M and N, one can derive other modules Ext^i (M,N), for all i. These modules contain certain information about M and N. We will show how to construct Ext explicitly and give some further results on how to use it.

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