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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.

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

A function f(t) of one or more parameters containing a noise term epsilon(t) f(t)=L(t)+epsilon(t), where the noise is (without loss of generality) assumed to be additive.

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

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

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.

L is a subnormal subgroup of H if there is a "normal series" (in the sense of Jordan-Hölder) from L to H.

A quantity which is subtracted from another (the minuend).

The set closure of the set of arguments of a function f for which f is not zero.