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Two quantities y and x are said to be inversely proportional (or "in inverse proportion") if y is given by a constant multiple of 1/x, i.e., y=c/x for c a constant. This ...

Attach a string to a point on a curve. Extend the string so that it is tangent to the curve at the point of attachment. Then wind the string up, keeping it always taut. The ...

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

A square matrix which is not reducible is said to be irreducible.

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.

An integral of motion which restricts the phase space available to a dynamical system.

To rearrange without cutting or pasting.

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