| 释义 |
Compact ManifoldA Manifold which can be ``charted'' with finitely many Euclidean Space charts. The Circle is the onlycompact 1-D Manifold. The Sphere and -Torus are the only compact 2-D Manifolds. It is an open question if the known compact Manifolds in 3-D are complete, and it is not even known whata complete list in 4-D should look like. The following terse table therefore summarizes current knowledge about the numberof compact manifolds of dimensions.  |  | | 1 | 1 | | 2 | 2 |
See also Tychonof Compactness Theorem
|