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Excerpt from Electromagnetic Scattering Matrices of Stratified Anisotropic Media The use of variational principles for the formulation of prob lems in mathematical physics is. Of course, very old; one thinks of Hamilton's principle, the principle of least action. And the various kinds of minimum energy principles that have been employed to character ize a multitude of physical situations. The attractiveness of these principles is ascribable to a feature common to all of them. Which is that they afford an extremely concise description of the phenomena under investigation. Moreover. In a great many problems the variational prin ciples lead very naturally to practical methods of estimating numerically the quantities it is desired to calculate. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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