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Homotopy theory, homological algebra, algebraic treatments of manifolds.

2 votes
0 answers
754 views

Leray-Hirsch for HOMOLOGY?

Let $E\to B$ be a fibre bundle. The Leray-Hirsch theorem states under suitable assumptions, the cohomology of $E$ is an $H^*(B)$-module generated by suitable cohomology classes in $E$. Is there any a …
Guangbo Xu's user avatar
  • 1,207
17 votes
4 answers
3k views

Poincare dual in equivariant (co)homology?

Let $G$ be a compact Lie group, $X$ be a (compact, oriented) smooth manifold, with $G$ acts on $X$ smoothly. Then we can talk about the $G$-equivariant homology and cohomology. My question: In what s …
Guangbo Xu's user avatar
  • 1,207
3 votes
0 answers
150 views

Integral Homology of GIT Quotients

Is there any example of GIT quotients of linear actions on a Euclidean space ${\mathbb C}^n$ that satisfy the following conditions? The quotient is compact and smooth. The homology of the quotient h …
Guangbo Xu's user avatar
  • 1,207
1 vote

Euler characteristics and operator indices as exponents for Laurent polynomials

I met this guy in quantum cohomology. More precisely, in examples of quantum coefficient ring. So if you tag the this problem with "symplectic geometry" or "symplectic topology" I think many people th …
Guangbo Xu's user avatar
  • 1,207