%0 Journal Article
%T On Blocking Numbers of Surfaces
%A Wing Kai Ho
%J Mathematics
%D 2008
%I arXiv
%X The blocking number of a manifold is the minimal number of points needed to block out lights between any two given points in the manifold. It has been conjectured that if the blocking number of a manifold is finite, then the manifold must be flat. In this paper we prove that this is true for 2-dimensional manifolds with non-trivial fundamental groups.
%U http://arxiv.org/abs/0807.2934v3