Sylvester's Four-Point Problem
Let 
be the probability that four points chosen at random in a region 
have a Convex Hull which is a Quadrilateral. For an open, convex subset of the Plane of finite Area,
References
Schneinerman, E. and Wilf, H. S. ``The Rectilinear Crossing Number of a Complete Graph and Sylvester's `Four Point' Problem of Geometric Probability.'' Amer. Math. Monthly 101, 939-943, 1994.
- 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