This book offers an account of a number of aspects of operator theory, mainly developed since the 1980s, whose problems have their roots in quantum theory. The research presented is in non-commutative operator approximation theory or, to use Halmos' terminology, in operator approximants. Focusing on the concept of approximants, this self-contained book is suitable for graduate courses.

Flycasting, that key pre-requisite to all successful trout and salmon fishing, can be a stumbling block for many anglers. This clear, well-illustrated guidebook will show you, step-by-step, how to execute all the casts you will ever need: from the basic overhead cast to the double-handed Spey cast, and from the simple roll cast to the flamboyant snake cast, and many more.