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Presented By: Combinatorics Seminar - Department of Mathematics

GL-algebras and the Noetherianity problem (combinatorics seminar)

Karthik Ganapathy, UC San Diego

Ptolemy's relation between the diagonals of a cyclic quadrilateral Ptolemy's relation between the diagonals of a cyclic quadrilateral
Ptolemy's relation between the diagonals of a cyclic quadrilateral
Draisma recently proved that finite length polynomial representations of the infinite general linear group GL are topologically GL-noetherian, i.e., the descending chain condition holds for GL-stable closed subsets. The scheme-theoretic variant of this theorem is a major open problem in the area. I will briefly outline the rich history of this problem and provide a negative answer in characteristic two.
Ptolemy's relation between the diagonals of a cyclic quadrilateral Ptolemy's relation between the diagonals of a cyclic quadrilateral
Ptolemy's relation between the diagonals of a cyclic quadrilateral

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