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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 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 module over a ring that is contained in and has the same addition as another module over the same ring.

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

The relationship x succeeds (or follows) y is written x≻y. The relation x succeeds or is equal to y is written x>=y.