1) The definitions of surface (in terms of gluing panels) and what it means for two surfaces to be topologically equivalent.
2) A description of the three features of surfaces that characterize them in terms of their topology.
3) Three examples of pairs of surfaces that agree on two of the features but differ on the third one. For example, an annulus and a torus are both ______ have ______ equal to 0, but differ in ______.
4) An explanation of whether a T-shirt and pair of sweat pants (no zipper) are topologically equivalent.
A surface is a two dimensional object. This time our bug can crawl along the surface in two independent directions at most points. In principle, a surface can be built up by gluing little square panels together. The squares might have to be very little and you may need lots of them to build a surface that has no visible corners, but from a topological point of view corners can be smoothed out. Two surfaces S1 and S2 are equivalent if there is a "nice" bijection between ...
Topological surfaces: definitions, examples of features of surfaces. Proving that a pair of sweat pants and a T-shirt are not topological equivalent.