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A group having an infinite number of elements. Some infinite groups, such as the integers or rationals, are not continuous groups.

An archaic term for calculus.

A geometric figure which touches only the sides (or interior) of another figure.

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.

A linear deconvolution algorithm.

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 ...

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 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.