Toronto Set Theory Seminar (schedule change)

Toronto Set Theory Seminar
Friday, June 17 from 1:30 to 3pm
Fields Institute, Room 210

Speaker: Dilip Raghavan (Fields)

Title: Weak squares

– – – –

Friday, June 24 from 1:30 to 3pm
Fields Institute, Room 210

Speaker: Peter Krautzberger (Michigan)

Title: Union ultrafilters are fascinating — a survey

One response to “Toronto Set Theory Seminar (schedule change)

  1. Samuel Coskey

    Peter has provided a preliminary outline:

    70s — On the way to Hindman’s Theorem
    —————————————-

    * 60s: Folkman/Rado/Sanders and the finitary version
    * 70 Galvin’s unpublished proof assuming “special” ultrafilters
    * 72 Hindmans CH-construction of “special” ultrafilters
    * 74 Hindman’s Theorem
    * 75 Galvin meets Glazer

    80s — Union ultrafilters
    —————————————-
    * 85 van Douwen asks a question
    * 87 Blass introduces union ultrafilters
    * stable ordered union ultrafilters
    * complete combinatorics
    * 87 Blass+Hindman
    * union ultrafilters == strongly summable ultrafilters
    * independence

    90s — Applications in $(beta mathbb{N}, +)$.
    —————————————-

    * 91 Hindman: the maximal group is minimal
    * 95 Hindman+Strauss: the trivial sums property

    00s — Applications in set theory
    —————————————-

    * 02 Eisworth:
    * the core of a union ultrafilter
    * Matet Forcing with stable ordered union ultrafilters
    * 09 Mildenberger+Shelah: separating NCF and FD

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