Compact Manifold
A 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 |
- Inversion Circle
- Inversion Operation
- Inversion Radius
- Inversive Distance
- Inversive Geometry
- Inverted Funnel
- Inverted Snub Dodecadodecahedron
- Invertible Knot
- Involuntary
- Involute
- Involution (Group)
- Involution (Line)
- Involution (Operator)
- Involution (Set)
- Involution (Transformation)
- Irradiation Illusion
- Irrationality Measure
- Irrationality Sequence
- Irrational Number
- Irreducible Matrix
- Irreducible Polynomial
- Irreducible Representation
- Irreducible Semiperfect Number
- Irreducible Tensor
- Irredundant Ramsey Number