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A relation R on a set S is irreflexive provided that no element is related to itself; in other words, xRx for no x in S.

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 map which is monotone increasing and therefore order-preserving.

To rearrange without cutting or pasting.

The principal normal indicatrix of a closed space curve with nonvanishing curvature bisects the area of the unit sphere if it is embedded.

Jacobi's imaginary transformations relate elliptic functions to other elliptic functions of the same type but having different arguments. In the case of the Jacobi elliptic ...

The jerk j is defined as the time derivative of the vector acceleration a, j=(da)/(dt).

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 ...

A bound on error-correcting codes.