Generalized Cauchy functional equation and characterizations of inner product spaces.
Generalized Cauchy functional equation and characterizations of inner product spaces. (Summary).
Geometría de gramianos en el espacio de Hilbert.
The purpose of the Part I of this paper is to develop the geometry of Gram's determinants in Hilbert space. In Parts II and III a generalization is given of the Pythagorean theorem and triangular inequality for finite vector families.
Grüss type inequalities for forward difference of vectors in inner product spaces.