Geometry of orthogonal spaces.

KREYSZIG The Wiley Classics Library consists of selected books originally published by John Wiley & Sons that have become recognized classics in their respectiv

This book contains both expository articles and original research in the areas of function theory and operator theory. The contributions include extended versio

Includes sections on the spectral resolution and spectral representation of self adjoint operators, invariant subspaces, strongly continuous one-parameter semig