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- W2916611309 abstract "We show that certain homological regularity properties of graded connected algebras, such as being AS-Gorenstein or AS-Cohen-Macaulay, can be tested by passing to associated graded rings. In the spirit of noncommutative algebraic geometry, this can be seen as an analogue of the classical result that, in a flat family of varieties over the affine line, regularity properties of the exceptional fiber extend to all fibers. We then show that quantized coordinate rings of flag varieties and Schubert varieties can be filtered so that the associated graded rings are twisted semigroup rings. This is a noncommutative version of the result due to Caldero stating that flag and Schubert varieties degenerate into toric varieties, and implies that quantized coordinate rings of flag and Schubert varieties are AS-Cohen-Macaulay." @default.
- W2916611309 created "2019-03-02" @default.
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- W2916611309 date "2019-02-20" @default.
- W2916611309 modified "2023-09-25" @default.
- W2916611309 title "Quantum toric degeneration of quantum flag and Schubert varieties" @default.
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