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SUMMARY:Christian Haase (FU Berlin)
DTSTART:20221013T141500Z
DTEND:20221013T160000Z
DTSTAMP:20260422T065751Z
UID:CJCS/89
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/CJCS/89/">Ne
 wton-Okounkov Semigroups (are often not finitely generated)</a>\nby Christ
 ian Haase (FU Berlin) as part of Copenhagen-Jerusalem Combinatorics Semina
 r\n\n\nAbstract\nI will start with a combinatorialist's crash course on to
 ric varieties which hopefully can be useful in its own right.\nAfter a sho
 rt break\, I will talk about Newton-Okounkov theory\, which is an attempt 
 to play as much of the toric game as possible with non-toric varieties. Th
 e theory associates an affine semigroup with a projectively embedded varie
 ty and tries to draw conlclusions from the asymptotic convex geometry of t
 his semigroup. Many of these theorems assume that the semigroup is finitel
 y generated\, but checking finite generation seems to be hard. I will desc
 ribe a combinatorial criterion\, in a slightly non-toric situation (toric 
 surface\, but non-toric valuation)\, characterizing finite generation. Thi
 s is joint work with Klaus Altmann\, Alex Küronya\, Karin Schaller & Lena
  Walter.\n
LOCATION:https://researchseminars.org/talk/CJCS/89/
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