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Excerpt from Fortran Programs for the Calculation of Wigner 3j, 6j, and 9j Coefficients for Angular Momenta A corresponds to two angular momentum vectors being of such length thatit is possible for them to couple to (or form a triangle with) the third. Any combination of integer and half-integer angular momentum vectors which would lead to factorials of half-integers in the formulae is also ruled out. Since the expression on the right hand side of Eq. (1) is manifestly symmetric with respect to any permutation of the indices 1. 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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