Talk:2-manifolds

You might want to add in http://www.map.mpim-bonn.mpg.de/2-manifolds#Classification that compact 2-manifolds (possibly with boundary) are homeomorphic if and only if they have isomorphic intersection forms. Cf. http://www.map.mpim-bonn.mpg.de/4-manifolds:_1-connected#Topological_classification