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The integral associated with the Haar measure.

An operator A^~ such that A^~^2=A^~ or an element of an algebra x such that x^2=x.

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

A locally finite space is one for which every point of a given space has a neighborhood that meets only finitely many elements of any cover.

A function used to study ordinary differential equations.

A minimization of the maximum error for a fixed number of terms.

A basis of a modular system M is any set of polynomials B_1, B_2, ... of M such that every polynomial of M is expressible in the form R_1B_1+R_2B_2+..., where R_1, R_2, ... ...

A surface given by the form z=F(x,y).

A quantity that is nonzero everywhere is said to be nonvanishing. For instance, the values of x^2+1 are nonvanishing for real x, while those of x^2 are not (since x^2 ...

A vector space possessing a norm.