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A rectifiable current whose boundary is also a rectifiable current.

This distribution is implemented in the Wolfram Language as InverseChiSquareDistribution[nu].

A linear deconvolution algorithm.

The symmetry operation (x,y,z)->(-x,-y,-z). When used in conjunction with a rotation, it becomes an improper rotation.

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.

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

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