Characteristic Classes of Orbit Stratifications, the Axiomatic Approach
Characteristic Classes of Orbit Stratifications, the Axiomatic Approach
复制标题
轨道分层的特征类别,公理化方法
DOI:
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发表时间:
2018
期刊:
影响因子:
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通讯作者:
A. Weber
中科院分区:
文献类型:
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作者:
L. Fehér;Richárd Rimányi;A. Weber
Consider a complex algebraic group $G$ acting on a smooth variety $M$ with finitely many orbits, and let $\Omega$ be an orbit. The following three invariants of $\Omega\subset M$ can be characterized axiomatically: (1) the equivariant fundamental class $[\overline{\Omega}, M]\in H^*_G(M)$, (2) the equivariant Chern-Schwartz-MacPherson class $c(\Omega, M)\in H^*_G(M)$, and (3) the equivariant motivic Chern class $mC(\Omega, M) \in K_G(M)[y]$. The axioms for Chern-Schwartz-MacPherson and motivic Chern classes are motivated by the axioms for cohomological and K-theoretic stable envelopes of Okounkov and his coauthors. For $M$ a flag variety and $\Omega$ a Schubert cell---an orbit of the Borel group acting---this implies that CSM and MC classes coincide with the weight functions studied by Rimanyi-Tarasov-Varchenko. In this paper we review the general theory and illustrate it with examples.
DOI:
10.1007/s00029-019-0451-5
发表时间:
2019
期刊:
Selecta Mathematica
影响因子:
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作者:
Rimányi, R.;Tarasov, V.;Varchenko, A.
通讯作者:
Varchenko, A.