The following three pieces of information completely determine the homeomorphic type of the surface (Massey 1967):

- 1. Orientability,
- 2. Number of boundary components,
- 3. Euler Characteristic.

**References**

Massey, W. S. *Algebraic Topology: An Introduction.* New York: Springer-Verlag, 1996.

© 1996-9

1999-05-25