## Quantum Theory Of Atomic Process

444 pages | 2007 | PDF | 10,5 Mb

TO MY FRIEND WALTER DALLENBACH FROM THE AUTHORS PREFACE TO THE FIRST GERMAN EDITION THE importance of the standpoint afforded by the theory of groups for the discovery of the general laws of quantum theory has of late become more and more apparent. Since I have for some years been deeply concerned with the theory of the representation of continuous groups, it has seemed to me appropriate and important to give an account of the knowledge won by mathematicians working in this field in a form suitable to the requirements of quantum physics.

An additional impetus is to be found in the fact that, from the purely mathematical standpoint, it is no longer justifiable to draw such sharp distinctions between finite and continuous groups in discussing the theory of their representations as has been done in the existing texts on the subject. My desire to show how the concepts arising in the theory of groups find their application in physics by discussing certain of the more important examples has necessitated the inclusion of a short account of the foundations of quantum physics, for at the time the manuscript was written there existed no treatment of the subject to which I could refer the reader. In brief this book, if it fulfills its purpose, should enable the reader to learn the essentials of the theory of groups and of quantum mechanics as well as the rela tionships existing between these two subjects the mathematical portions have been written with the physicist in mind, and vice versa. I have particularly emphasized the reciprocity M be tween the representations of the symmetric permutation group and those of the complete linear group this reciprocity has as yet been unduly neglected in the physical literature, in spite of the fact that it follows most naturally from the conceptual structure of quantum mechanics. vii viii THE THEORY OF GROUPS There exists, in my opinion, a plainly discernible parallelism between the more recent developments of mathematics and physics. Occidental mathematics has in past centuries broken away from the Greek view and followed a course which seems to have originated in India and which has been transmitted, with additions, to us by the Arabs in it the concept of number appears as logically prior to the concepts of geometry.

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