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The determination of the number of alternating permutations having elements {1,2,...,n}.

A shuffling algorithm used in a class of random number generators.

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

A multiple series is a series involving sums over more than one index.

A series involving three sums. Examples of convergent triple series include sum_(i=1)^(infty)sum_(j=1)^(infty)sum_(k=1)^(infty)1/((ijk)^2) = 1/(216)pi^6 (1) ...

The Smarandache function mu(n) is the function first considered by Lucas (1883), Neuberg (1887), and Kempner (1918) and subsequently rediscovered by Smarandache (1980) that ...

A nonplanar graph is a graph that is not planar. The numbers of simple nonplanar graphs on n=1, 2, ... nodes are 0, 0, 0, 0, 1, 14, 222, 5380, 194815, ... (OEIS A145269), ...

The number of poles of an automorphic function in the closure of its fundamental region.

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

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