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S_n=sum_(i)eta_imu(E_i), where mu(E_i) is the measure of the set E_i of points on the x-axis for which f(x) approx eta_i.

An attracting set to which orbits or trajectories converge and upon which trajectories are periodic.

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

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.