This talk on Ultrafilters was held on Wednesday October 12, 2016 in MC 4020. The talk was given by Felix Bauckholt.

Abstract

In this talk, I will try to explain what ultrafilters are. I will do this by presenting a few motivating examples, and also some examples that, even if they don't motivate anything, are just really cool.

Hyperreal numbers are used to motivate this talk.

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