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

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.

As originally stated by Gould (1972), GCD{(n-1; k),(n; k-1),(n+1; k+1)} =GCD{(n-1; k-1),(n; k+1),(n+1; k)}, (1) where GCD is the greatest common divisor and (n; k) is a ...

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.