All Questions

In this well celebrated work Gregory Rybnikov exhibit an example of two arrangements with the same underlying matroid, but with fundamental groups which are not isomorphic. This is a key ...

I'm working on some presentation of the fundamental group of the complement of a complex lines arrangement in $\mathbb{C}^{2}.$ In particular, in Arvola's article "The fundamental group of the ...

A minimal complex is a CW complex whose only cells are the homology cells. Is there some sort of criterion on CW complexes about existence of minimal complexes? Actually I am working on a problem ...