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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 alternating permutations for n elements is sometimes called an Euler zigzag number. Denote the number of alternating permutations on n elements for which the ...

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

The order of a finite field is the number of elements it contains.

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

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

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

The symbol "-" which is used to denote a negative number or subtraction.

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