(mathematics) The result that the Fourier transform is unitary; loosely, that the sum (or integral) of the square of a function is equal to the sum (or integral) of the square of its transform.

A Scottish habitational surname. / A Scottish surname from Scottish Gaelic [in turn originating as a patronymic]. / A surname from Irish [in turn originating as a patronymic]. / A town in Alberta, ...

Relations with others. / Business transactions.

plural of nonrenewable