Invariants under tori of rings of differential operators and related topics
著者
書誌事項
Invariants under tori of rings of differential operators and related topics
（Memoirs of the American Mathematical Society, no. 650）
American Mathematical Society, 1998
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注記
"November 1998, volume 136, number 650 (fifth of 6 numbers)"
Includes bibliographical references
内容説明・目次
内容説明
If $G$ is a reductive algebraic group acting rationally on a smooth affine variety $X$, then it is generally believed that $D(X)^G$ has properties very similar to those of enveloping algebras of semisimple Lie algebras. In this book, the authors show that this is indeed the case when $G$ is a torus and $X=k^r\times (k^*)^s$. They give a precise description of the primitive ideals in $D(X)^G$ and study in detail the ring theoretical and homological properties of the minimal primitive quotients of $D(X)^G$. The latter are of the form $B^x=D(X)^G/({\mathfrak g}-\chi({\mathfrak g}))$ where ${\mathfrak g}=\textnormal{Lie}(G)$, $\chi\in {\mathfrak g}^\ast$ and ${\mathfrak g}-\chi({\mathfrak g})$ is the set of all $v-\chi(v)$ with $v\in {\mathfrak g}$. They occur as rings of twisted differential operators on toric varieties. It is also proven that if $G$ is a torus acting rationally on a smooth affine variety, then $D(X[LAMBDA]!/G)$ is a simple ring.
目次
Introduction Notations and conventions A certain class of rings Some constructions The algebras introduced by S. P. Smith The Weyl algebras Rings of differential operators for torus invariants Dimension theory for $B^\chi$ Finite global dimension Finite dimensional representations An example References.
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