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Excerpt from On the Dirichlet Problem for the Reduced Wave Equation <p>A. All the regular surface elements having a vertex in common form a chain such that each has an edge (terminating in that vertex) in common with the next; the last may, or may not, have an edge in common with the first. <p>About the Publisher <p>Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com <p>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.