What is ... an ultrafilter?

This page hosts information on Peter Krautzberger's talk "What is ... an ultrafilter?" at the "What is ...?" seminar.

Where & When

  • Friday, June 8, 2018, 2.30pm @ TU MA 415
  • NOTE: the 10th anniversary will start already at 2.00pm (sharp!) and end around 6.00pm at latest. The talk itself may start a bit later than 2.30pm if the preceding quiz lasts longer than planned.
  • Further information about the 10th anniversary


  • A historic re-enactment of the very first "What is ...?" talk, 0% fewer mistakes guaranteed.
  • We'll introduce the basic notions for ultrafilters, discuss fundamental examples and properties and, if time permits, build a simple model of hyperreals.
Topic revision: r2 - 28 May 2018, AndrasTobias
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