A birational invariant for algebraic group actions
A birational invariant for algebraic group actions
复制标题
代数群作用的双有理不变量
DOI:
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发表时间:
2000
期刊:
影响因子:
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通讯作者:
B. Youssin
中科院分区:
文献类型:
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作者:
Z. Reichstein;B. Youssin
We construct a birational invariant for certain algebraic group actions. We use this invariant to classify linear representations of finite abelian groups up to birational equivalence, thus answering, in a special case, a question of E.B. Vinberg and giving a family of counterexamples to a related conjecture of P.I. Katsylo. We also give a new proof of a theorem of M. Lorenz on birational equivalence of quantum tori (in a slightly expanded form) by applying our invariant in the setting of PGL n -varieties.