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SUMMARY:Alexandru Constantinescu (Freie Universität Berlin)
DTSTART:20230331T223000Z
DTEND:20230331T233000Z
DTSTAMP:20260422T054639Z
UID:SFUQNTAG/91
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SFUQNTAG/91/
 ">Cotangent Cohomology for Matroids</a>\nby Alexandru Constantinescu (Frei
 e Universität Berlin) as part of SFU NT-AG seminar\n\nLecture held in 3:3
 0-4:20.\n\nAbstract\nThe first cotangent cohomology module $T^1$ describes
  the first order deformations of a commutative ring. For Stanley-Reisner r
 ings\, this module has a purely combinatorial description: its multigraded
  components are given as the relative cohomology of some topological space
 s associated to the defining simplicial complex. When the Stanley-Reisner 
 ring is associated to a matroid\, I will present a very explicit formula f
 or the dimensions of these components. Furthermore\, I will show that $T^1
 $ provides a new complete characterization for matroids.\n
LOCATION:https://researchseminars.org/talk/SFUQNTAG/91/
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