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Excerpt from Journal für die Reine und Angewandte Mathematik, 1861, Vol. 58: In Zwanglosen Heften; In Vier Heften Des coordonnées curvilignes se coupant sous un angle quelconque. Par M. L'abbe Aoual a Marseille. 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.