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Three sets of three lines such that each line is incident with two from both other sets.

The unit of solid angle. The solid angle corresponding to all of space being subtended is 4pi steradians.

Stirling's approximation gives an approximate value for the factorial function n! or the gamma function Gamma(n) for n>>1. The approximation can most simply be derived for n ...

A method of stochastic optimization including techniques such as gradient search or Robbins-Monro stochastic approximation.

If 0<=g(x)<=1 and g is nonincreasing on the interval [0, 1], then for all possible values of a and b, int_0^1g(x^(1/(a+b)))dx>=int_0^1g(x^(1/a))dxint_0^1g(x^(1/b))dx.

The p-adic norm satisfies |x+y|_p<=max(|x|_p,|y|_p) for all x and y.

The series of Sturm functions arising in application of the Sturm theorem.

An algebra S^' which is part of a large algebra S and shares its properties.

A C^infty (infinitely differentiable) manifold is said to be a submanifold of a C^infty manifold M^' if M is a subset of M^' and the identity map of M into M^' is an ...

A p×q submatrix of an m×n matrix (with p<=m, q<=n) is a p×q matrix formed by taking a block of the entries of this size from the original matrix.