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Normality and Non Normality Of Certain Semigroups and Orbit Closures,ctification of the adjoint quotient of . and its projective normality . These methods are then used to discuss the normality or non normality of certain other orbit closures including determinantal varieties.transplantation 发表于 2025-3-25 13:10:56
,Geometric Realization Of ,-shaped Root Systems and Counterexamples To Hilbert’s Fourteenth Problem,application we show that the invariant ring of a tensor product of the actions of Nagata type is infinitely generated if the Weyl group of the corresponding root system .. is indefinite. In this sense this article is a continuation of .promote 发表于 2025-3-25 17:09:41
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https://doi.org/10.1057/9780230319974application we show that the invariant ring of a tensor product of the actions of Nagata type is infinitely generated if the Weyl group of the corresponding root system .. is indefinite. In this sense this article is a continuation of .ARM 发表于 2025-3-26 20:44:24
Losing the Signal in the Noise,jectivized nilpotent varieties of isotropy modules. For them, we classify all orbit closures . such that . where . is the projective dual of .. We give algebraic criteria of projective self-duality for the considered orbit closures.