In mathematics (specifically in differential geometry and topology) a manifold is a mathematical space that on a small enough scale resembles the Euclidean space of a specific dimension, called the dimension of the manifold. Thus, a line and a circle are one-dimensional manifolds, a plane and sphere (the surface of a ball) are two-dimensional manifolds, and so on into high-dimensional space.

— Wikipedia on Manifold

2011.02.02 Wednesday ACHK