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A word or string which is not admissible.

Two objects which touch each other are said to be incident.

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

The inverse secant sec^(-1)z (Zwillinger 1995, p. 465), also denoted arcsecz (Abramowitz and Stegun 1972, p. 79; Harris and Stocker 1998, p. 315; Jeffrey 2000, p. 124), is ...

An operator of period 2, i.e., an operator * which satisfies ((a)^*)^*=a.

A vector field v for which the curl vanishes, del xv=0.

A polynomial in which the sum of subscripts is the same in each term.

A sampling phenomenon produced when a waveform is not sampled uniformly at an interval t each time, but rather at a series of slightly shifted intervals t+Deltat_i such that ...

The Jordan product of quantities x and y is defined by x·y=1/2(xy+yx).

A set considered together with the sigma-algebra on the set.