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A Z-action or N-action. A cascade and a single map X->X are essentially the same, but the term "cascade" is preferred by many Russian authors.

K=-e^2, where e is the eccentricity of a conic section.

If q is logically deducible from p, this is written p|-q.

The product of three translations along the directed sides of a triangle through twice the lengths of these sides is the identity map.

In the American system, 10^(39).

Ein(z) = int_0^z((1-e^(-t))dt)/t (1) = E_1(z)+lnz+gamma, (2) where gamma is the Euler-Mascheroni constant and E_1 is the En-function with n=1.

A one-dimensional geometric object such as a pencil or line segment range.

A set of statistical distributions having the same variance.

A quantity which is either 0 (zero) or positive, i.e., >=0.

In general, the opposite of trivial.