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  6. Formulating kappa-complete ultrafilters in category theory

Pure Mathematics event

Formulating kappa-complete ultrafilters in category theory

  • Date: Wednesday 12 December 2018, 14:00 – 15:00
  • Location: Mathematics Level 8, MALL 1, School of Mathematics
  • Type: Proofs, Constructions and Computations, Seminars, Pure Mathematics
  • Cost: Free
  • Download: Outlook, iCal

Andrew Brooke-Taylor, University of Leeds. Part of the proofs, constructions and computations seminar series.

An old theorem of Isbell shows how one can formulate the measurability of a cardinal in category-theoretic terms.  After presenting Isbell's result, I will discuss some more recent ideas (from joint work with Joan Bagaria and Jiri Rosicky) about formulating normality of an ultrafilter in a similar way.