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A number of the form a_0+a_1zeta+...+a_(p-1)zeta^(p-1), where zeta=e^(2pii/p) is a de Moivre number and p is a prime number. Unique factorizations of cyclotomic integers fail ...

A series s_1,s_2,... for which s_1>=s_2>=....

If lim_(k->infty)u_k!=0, then the series {u_n} diverges.

Distinguish between smooth manifolds in four dimensions.

Each centered convex body of sufficiently high dimension has an "almost spherical" k-dimensional central section.

Johnson solid J_7.

A 19-sided polygon, sometimes also called the enneakaidecagon.

A mathematical statement of the equivalence of two quantities. The equality "A is equal to B" is written A=B.

An area-preserving affine transformation. Equiaffinities include the crossed hyperbolic rotation, elliptic rotation, hyperbolic rotation, and parabolic rotation.

A point, such as interior points of a disk, such that (px)(py)=[const], where p is the chord length.