© 2004 by London Mathematical Society
© The London Mathematical Society
Structure Theorems for Riemann and Topological Surfaces
Departamento de Análisis Matemático, Facultad de Ciencias, Universidad de Málaga Campus de Teatinos, 29071 Málaga, Spain, nancho{at}anamat.cie.uma.es
Departamento de Matemáticas, Universidad Carlos III de Madrid Avenida de la Universidad, 30, 28911 Leganés, Spain, jomaro{at}math.uc3m.es
Received 26 November 2000. Revision received 16 April 2003.
The classification theorem of compact surfaces states that every topological orientable compact surface is homeomorphic to a sphere or to a torus of genus g, with g=1,2,.... It is proved in the paper that every hyperbolic Riemann surface except for D\{0} can be decomposed into basic pieces of only a few different types: Y-pieces, funnels and half-disks. As a corollary of this result, the generalization of the classification theorem to non-compact surfaces is obtained.