Coxeter Matrix
An 
Square Matrix 
with
 |  |  | |
 | |  |
for all
, ..., 
.See also Coxeter Group- Diophantus Property
- Diophantus' Riddle
- Dipyramid
- Dirac Delta Function
- Dirac Matrices
- Dirac's Theorem
- Directed Angle
- Directed Graph
- Directional Derivative
- Direction Cosine
- Directly Similar
- Director Curve
- Direct Product (Group)
- Direct Product (Matrix)
- Direct Product (Set)
- Direct Product (Tensor)
- Directrix (Conic Section)
- Directrix (Graph)
- Directrix (Ruled Surface)
- Direct Search Factorization
- Direct Sum (Module)
- Dirichlet Beta Function
- Dirichlet Boundary Conditions
- Dirichlet Conditions
- Dirichlet Divisor Problem