THE recent proposal 1 to analyse shapes of biological objects by means of orthonormal functions opens up some interesting possibilities. In the work cited, a particular set of two-dimensional ...

Abstract In this paper we consider functions in the Hardy space H2p×q defined in the unit disc of matrix-valued functions. We show that it is possible, as in the scalar case, to decompose those ...

IT was recently proposed 1 that biological form should be specified by an expansion of the characteristic function of the form as a weighted sum of the elements of a complete set of orthonormal ...

Geometrical insights are very helpful when learning about the Fourier series. Instead of focusing on trigonometric or exponential functions, we consider a more general collection of orthonormal ...