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A base-60, or sexagesimal, number system, used by the ancient Babylonians.

A variable which belongs to exactly one of a finite number of categories.

The number of elements of a group in a given conjugacy class.

A tree spread in which each node has a finite number of children.

A circle-preserving transformation composed of an even number of inversions.

A minimization of the maximum error for a fixed number of terms.

A formula which counts the number of fixed points for a topological transformation.

The symbol "+" which is used to denote a positive number or to indicate addition.

A quadrature (numerical integration) algorithm which has a number of desirable properties.

Go is played on a 19×19 grid, with pieces being placed at the intersections of grid lines, rather than in the middle of them. Go boards have a number of peculiarities, ...