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Always increasing; never remaining constant or decreasing. Also called strictly increasing.

An n-digit number that is the sum of the nth powers of its digits is called an n-narcissistic number. It is also sometimes known as an Armstrong number, perfect digital ...

An element B of a ring is nilpotent if there exists a positive integer k for which B^k=0.

A vector space possessing a norm.

A function f:A->B such that B is a set of numbers.

The ring R[x] of polynomials in a variable x.

Predictability at a time tau in the future is defined by (R(x(t),x(t+tau)))/(H(x(t))), and linear predictability by (L(x(t),x(t+tau)))/(H(x(t))), where R and L are the ...

A pseudoprime is a composite number that passes a test or sequence of tests that fail for most composite numbers. Unfortunately, some authors drop the "composite" ...

A group of five elements, also called a quintuple or pentad.

A quadratic field Q(sqrt(D)) with D>0.