Riemann surface
Noun
Meaning
Riemann surface (plural Riemann surfaces)
(mathematics) A one-dimensional complex manifold; a generalization of the complex plane.
Examples
Any complex nonsingular algebraic curve viewed as a complex manifold is a Riemann surface.
For example, the Riemann–Roch theorem (Roch was a student of Riemann) says something about the number of linearly independent differentials (with known conditions on the zeros and poles) of a Riemann surface.
For the Riemann surface has parameters (the "moduli").
Given a Riemann surface M, the set of all meromorphic functions defined on M is a field, denoted by C(M).
Note that the uniformization theorem implies that every compact Riemann surface of genus one can be represented as a torus.