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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.

A simple way to enumerate some types of groups due to J. H. Conway (Zwillinger 1995).