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A vector field on a circle in which the directions of the vectors are all at the same angle to the circle.

A rotation combined with an expansion or geometric contraction.

The Reidemeister move of type I.

A specific type of ultraproduct that can be used to construct nonstandard universes and obtain the transfer principle as a corollary of Łoś' theorem for ultraproducts.

In the American system, 10^(36).

A statistical distribution such as the normal distribution which has a single "peak."

The property of being the only possible solution (perhaps modulo a constant, class of transformation, etc.).

A ball of radius 1.

A transformation of the form A^'=UAU^(H), where U^(H) denotes the conjugate transpose.

Capable of taking on exactly one possible value.