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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.

When ac is divisible by a number b that is relatively prime to a, then c must be divisible by b.

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 ...

An even perfect number is perfect number that is even, i.e., an even number n whose sum of divisors (including n itself) equals n. All known perfect numbers are even, and ...

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 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.