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The 34 distinct convergent hypergeometric series of order two enumerated by Horn (1931) and corrected by Borngässer (1933). There are 14 complete series for which ...

The square-triangle theorem states that any nonnegative integer can be represented as the sum of a square, an even square, and a triangular number (Sun 2005), i.e., ...

The process of taking the complement of a set or truth function. In the latter case, complementation is equivalent to the NOT operation.

Johnson solid J_(90).

The principal normal indicatrix of a closed space curve with nonvanishing curvature bisects the area of the unit sphere if it is embedded.

In the American system, 10^(27).

The vertex of a polytope is a point where edges of the polytope meet.

Rubik's Cube is a 3×3×3 cube in which the 26 subcubes on the outside are internally hinged in such a way that rotation (by a quarter turn in either direction or a half turn) ...

An algebra S^' which is part of a large algebra S and shares its properties.

A relation R on a set S is transitive provided that for all x, y and z in S such that xRy and yRz, we also have xRz.