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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 ...

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.

A map which is monotone increasing and therefore order-preserving.

To rearrange without cutting or pasting.

J_(nualphabeta)^mu=J_(nubetaalpha)^mu=1/2(R_(alphanubeta)^mu+R_(betanualpha)^mu), where R is the Riemann tensor.