Orientable surfaces could be visualized, and their diffeomorphism classes enumerated, by genus. Presented two orientable surfaces, one can identify When they are diffeomorphic by computing their respective genera and evaluating: They're diffeomorphic if and provided that the genera are equal, Hence the genus sorts a complete list of invariants. Reduction http://simonbpxgk.bluxeblog.com/18407896/details-fiction-and-manifold-valve