Excerpt from Die Theorie der Parallellinien von Euklid bis auf Gauss: Eine Urkundensammlung zur Vorgeschichte der Nichteuklidischen Geometrie, in Gemeinschaft mit Friedrich Engel Carl Friedrich Gaufs, 1777 - 1855 Einleitung und Litteratur. D1eparallelentheoue1nfrankrerch(d'alembertfourie1, lag1ange Laplace, Legend1e) 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.