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This book has a threefold purpose: to explain the physical concepts of quantum mechanics, to describe the mathematical formalism, and to present illustrative examples of both the ideas and the methods. The book is intended to serve as a text at the graduate level and also as a reference book. Salient Features Section added on complex potentials and the reciprocity and optical theorems, density operator and matrix. New chapter on Symmetry in Quantum Mechanics discusses geometrical and dynamical symmetries and includes a detailed account of angular momentum.