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7 votes
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Ample divisors on $T$-varieties

Also, $X$ admits a $T$-equivariant closed embedding into $\mathbb{P}(V)$, where $V$ is a multiplicity free $T$-module. In particular, $T$ has finitely many fixed points on $X$. …
Geordie Williamson's user avatar
10 votes

Formality of classifying spaces

This is an old question. But sometimes old questions get answered! Benson, Greenlees, Formality of cochains on BG Here is the abstract: Let $G$ be a compact Lie group with maximal torus $T$. If $|N_G( …
Geordie Williamson's user avatar
21 votes
3 answers
2k views

Formality of classifying spaces

*) for example because $H(BG, \mathbb{Q})$ is a poynomial algebra, and $\mathcal{A}$ admits a graded commutative model using the de Rham complex -- see Bernstein-Lunts "Equivariant sheaves and functors …
Geordie Williamson's user avatar