Incidence Matrix
For a 
-D Polytope 
, the incidence matrix is defined by
The
th row shows which s surround 
, and the 
th column shows which 
s bound 
.Incidence matrices are also used to specify Projective Planes. The incidence matrices for a Tetrahedron 
are | 1 |  |  |  |
| 1 | 1 | 1 | 1 | 1 |
 |  |  |  |  |  |  |
| 1 | 0 | 0 | 0 | 1 | 1 |
| 0 | 1 | 0 | 1 | 0 | 1 |
| 0 | 0 | 1 | 1 | 1 | 0 |
 | 1 | 1 | 1 | 0 | 0 | 0 |
 |  |  |  |  |
| 0 | 1 | 1 | 0 |
| 1 | 0 | 1 | 0 |
| 1 | 1 | 0 | 0 |
| 1 | 0 | 0 | 1 |
| 0 | 1 | 0 | 1 |
| 0 | 0 | 1 | 1 |
 | |
| 1 |
| 1 |
| 1 |
| 1 |
- Link Diagram
- Linking Number
- Links Curve
- Linnik's Constant
- Linnik's Theorem
- Lin's Method
- Liouville Function
- Liouville Measure
- Liouville Number
- Liouville Polynomial Identity
- Liouville-Roth Constant
- Liouville's Boundedness Theorem
- Liouville's Conformality Theorem
- Liouville's Conic Theorem
- Liouville's Constant
- Liouville's Elliptic Function Theorem
- Liouville Space
- Liouville's Phase Space Theorem
- Liouville's Rational Approximation Theorem
- Liouville's Sphere-Preserving Theorem
- Lipschitz Condition
- Lipschitz Function
- Lipschitz's Integral
- Lissajous Curve
- Lissajous Figure