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The number of inward directed graph edges from a given graph vertex in a directed graph.

While an equality A=B states that two mathematical expressions are equal, an inequation A!=B states that two expressions are not equal.

The problem of deciding if two knots in three-space are equivalent such that one can be continuously deformed into another.

A knot diagram which does not specify whether crossings are under- or overcrossings.

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 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.