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(x^2+axy+by^2)(t^2+atu+bu^2)=r^2+ars+bs^2, (1) where r = xt-byu (2) s = yt+xu+ayu. (3)

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 set of sample problems in unconstrained optimization is given by loading Optimization`UnconstrainedProblems` and evaluating $FindMinimumProblems.

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.