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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.

The graph complement of a graph hole. Graph antiholes are called even if they have an even number of vertices and odd if they have an odd number of vertices (Chvátal). No odd ...

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 class m, curve order n, number of ordinary double points delta, number of cusps kappa, number of inflection points (inflection points) iota, number of bitangents tau, and ...

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