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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.

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

An 80-sided polygon.

The star polygon {8/3}.

One of the eight regions of space defined by the eight possible combinations of signs (+/-,+/-,+/-) for x, y, and z.

A 48-faced polygon.

An 8-polyiamond.

A system of parameter chain complexes used for multiplication on differential graded algebras up to homotopy.