All Questions

Jan Jaworowski, in 2000, proved the following theorem (I came to know about it from here) Jaworowski (2000) : Let $Y$ be a finite simplicial complex of dimension $k$ and let $n\ge 2k$. If $f:S^n\to Y$...

I was trying to read Fine and Triantafillou's paper "On the equivariant formality of Kahler manifolds with finite group action". They have defined the enlargement at $H$ of a system of DGA's ...

Let $G$ be any topological group. Then we can form the infinite join $E_G$ of $G$, i.e. the colimit $G*G*G\cdots$. Is $E_G$ contractible? I mean it is clear that $E_G$ is weakly contractible, but ...