On the fundamental group of real toric varieties

Details On the fundamental group of real toric varieties On the fundamental group of real toric varieties

2006-07-26

arxiv.org/abs/math/0607663v1

Proc. Indian Acad. Sci. (Math. Sci), Vol. 114, No. 1, February 2004, pp-15-31.

Mathematics

Algebraic Geometry

17 pages

Scientific paper

Let $X(\Delta)$ be the real toric variety associated to a smooth fan $\Delta$. The main purpose of this article is: (i) to determine the fundamental group and the universal cover of $X(\Delta)$, (ii) to give necessary and sufficient conditions on $\Delta$ under which $\pi_1(X(\Delta))$ is abelian, (iii) to give necessary and sufficient conditions on $\Delta$ under which $X(\Delta)$ is aspherical, and when $\Delta$ is complete, (iv) to give necessary and sufficient conditions for $\cc_{\Delta}$ to be a $K(\pi,1)$ space where $\cc_{\Delta}$ is the complement of a real subspace arrangement associated to $\Delta$.

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