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An integer that is either 0 or negative, i.e., a member of the set {0} union Z^-, where Z-- denotes the negative integers.

A quantity that is nonzero everywhere is said to be nonvanishing. For instance, the values of x^2+1 are nonvanishing for real x, while those of x^2 are not (since x^2 ...

If a prime number divides a norm but not the bases of the norm, it is itself a norm.

In the American system, 10^(60).

The number p in a fraction p/q, i.e., the dividend.

A function f:A->B such that B is a set of numbers.

Sampling at the Nyquist frequency.

A mathematical structure (e.g., a group, vector space, or smooth manifold) in a category.

An angle which is not a right angle or a multiple of a right angle.

An 80-sided polygon.