I was going to add another example, but I can't remember now. Something to do with vector space dimensions; you have a topological space, "over" every point there's a vector space, and the dimensions are locally constant. Vector bundle isn't it, since there the fibers are all isomorphic to the same vector space and so the dimension function is even constant. AxelBoldt 17:02, 24 Nov 2003 (UTC)