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arXiv 2202.07095math.ATmath.AC
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等变上同调环的一个度公式

A Degree Formula for Equivariant Cohomology Rings

Mark Blumstein, Jeanne Duflot

摘要:

本文推广了Lynn关于等变上同调环$H^*_G(X)$的“度”的一个结果.分次模的度是其Poincaré级数的一个系数,与重数密切相关。本文研究等变上同调环的这些交换代数不变式。主要定理是度的可加性公式:$$deg(H^*_G(X)) = \sum_{[A,c] \in \mathcal{Q'}_{max}(G,X)}\frac{1}{|W_G(A,c)|} °(H^*_{C_G(A,c)}(c)).$$我们还展示了这个公式与交换代数的可加性公式的关系,展示了度不变量的代数和几何特征。

英文摘要:

This paper generalizes a result of Lynn on the "degree" of an equivariant cohomology ring $H^*_G(X)$. The degree of a graded module is a certain coefficient of its Poincaré series, and is closely related to multiplicity. In the present paper, we study these commutative algebraic invariants for equivariant cohomology rings. The main theorem is an additivity formula for degree: $$deg(H^*_G(X)) = \sum_{[A,c] \in \mathcal{Q'}_{max}(G,X)}\frac{1}{|W_G(A,c)|} °(H^*_{C_G(A,c)}(c)).$$ We also show how this formula relates to the additivity formula from commutative algebra, demonstrating both the algebraic and geometric character of the degree invariant.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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