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DTSTART;TZID=Europe/Berlin:20220202T093000
DTEND;TZID=Europe/Berlin:20220202T110000
DTSTAMP:20211124T140249Z
CREATED:20211102T151820Z
LAST-MODIFIED:20211124T140249Z
UID:1876-1643794200-1643799600@crc326gaus.de
SUMMARY:Comparison with Čech cohomology\, adic version (Part 1)
DESCRIPTION:Christian Dahlhausen
URL:https://crc326gaus.de/event/comparison-with-cech-cohomology-adic-version-part-1/
LOCATION:Heidelberg\, MATHEMATIKON\, SR 4\, INF 205\, Heidelberg\, Germany
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220203T150000
DTEND;TZID=Europe/Berlin:20220203T180000
DTSTAMP:20220201T144412Z
CREATED:20211027T142956Z
LAST-MODIFIED:20220201T144412Z
UID:1826-1643900400-1643911200@crc326gaus.de
SUMMARY:Hodge theory of matroids (Session 6) / CRC-Colloquium
DESCRIPTION:This semester’s topic in our joint research seminar is Hodge theory of matroids. The meetings take place on Zoom on a bi-weekly basis during lecture time\, Thursdays 15-18. \nTalk 11: June Huh (Princeton University): Kazhdan-Lusztig and singular Hodge theory for matroids \nAbstract: There is a remarkable parallel between the theory of Coxeter groups (think of the symmetric group or the dihedral group) and matroids (think of your favorite graph or vector configuration). After giving an overview of the similarity\, I will report proofs of two combinatorial conjectures\, the nonnegativity conjecture for Kazhdan-Lusztig coefficients and the top-heavy conjecture for the number of flats of matroids. The key step is to formulate and prove an analogue of the decomposition theorem for a resolution of singularities in a combinatorial setup\, which is closely related to the validity of the hard Lefschetz theorem and the Hodge-Riemann relations for what would be an intersection Chow cohomology in realizable cases. The talk should be enjoyable without specialized knowledge. Joint work with Tom Braden\, Jacob Matherne\, Nick Proudfoot\, and Botong Wang.
URL:https://crc326gaus.de/event/hodge-theory-of-matroids-session-6/
LOCATION:Frankfurt and Zoom
CATEGORIES:GAUS-AG
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220209T093000
DTEND;TZID=Europe/Berlin:20220209T110000
DTSTAMP:20211124T140318Z
CREATED:20211102T151915Z
LAST-MODIFIED:20211124T140318Z
UID:1878-1644399000-1644404400@crc326gaus.de
SUMMARY:Comparison with Čech cohomology\, adic version (Part 2)
DESCRIPTION:Christian Dahlhausen
URL:https://crc326gaus.de/event/comparison-with-cech-cohomology-adic-version-part-2/
LOCATION:Heidelberg\, MATHEMATIKON\, SR 4\, INF 205\, Heidelberg\, Germany
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220216T093000
DTEND;TZID=Europe/Berlin:20220216T110000
DTSTAMP:20211124T140340Z
CREATED:20211102T152003Z
LAST-MODIFIED:20211124T140340Z
UID:1880-1645003800-1645009200@crc326gaus.de
SUMMARY:Suslin homology
DESCRIPTION:Katharina Hübner
URL:https://crc326gaus.de/event/suslin-homology/
LOCATION:Heidelberg\, MATHEMATIKON\, SR 4\, INF 205\, Heidelberg\, Germany
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220217T150000
DTEND;TZID=Europe/Berlin:20220217T180000
DTSTAMP:20220201T130616Z
CREATED:20211027T143742Z
LAST-MODIFIED:20220201T130616Z
UID:1829-1645110000-1645120800@crc326gaus.de
SUMMARY:Hodge theory of matroids (Session 7)
DESCRIPTION:This semester’s topic in our joint research seminar is Hodge theory of matroids. The meetings take place on Zoom on a bi-weekly basis during lecture time\, Thursdays 15-18.\nLast meeting: Discussion of topics for the next seminar
URL:https://crc326gaus.de/event/hodge-theory-of-matroids-session-7/
LOCATION:Frankfurt and Zoom
CATEGORIES:GAUS-AG
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