Space Division
The number of regions into which space can be divided by 
Spheres is
giving 2, 4, 8, 16, 30, 52, 84, ... (Sloane's A046127).See also Plane Division
References
Sloane, N. J. A. Sequence A046127in ``The On-Line Version of the Encyclopedia of Integer Sequences.''http://www.research.att.com/~njas/sequences/eisonline.html.
- Dedekind Ring
- Dedekind's Axiom
- Dedekind's Problem
- Dedekind Sum
- Deducible
- Deep Theorem
- Defective Matrix
- Defective Number
- Deficiency
- Deficient Number
- Definable Set
- Defined
- Definite Integral
- Degenerate
- Degree
- Degree (Algebraic Surface)
- Degree (Map)
- Degree of Freedom
- Degree (Polynomial)
- Degree Sequence
- Degree (Vertex)
- Dehn Invariant
- Dehn's Lemma
- Dehn Surgery
- de Jonquières Theorem