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Integer programming in a special case of linear programming in which all variables are required to take on integer values only. Set covering deployment is an example ...

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 invertible knot is a knot that can be deformed via an ambient isotopy into itself but with the orientation reversed. A knot that is not invertible is said to be ...

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

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.