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An element B of a ring is nilpotent if there exists a positive integer k for which B^k=0.

Given two starting numbers (a_1,a_2), the following table gives the unique sequences {a_i} that contain no three-term arithmetic progressions. Sloane sequence A003278 1, 2, ...

An algebraic surface of degree 9. Enneper's minimal surface is an example of a nonic surface.

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 ...

A vector space possessing a norm.

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.