Excerpt from Four-Dimensional Vistas<br><br>There are two notable emancipations Of the mind from the tyranny Of mere appearances that have received scant attention save from mathematicians and theoretical physicists.<br><br>In 1823 Bolyai declared with regard to Euclid's so-called axiom Of parallels, I will draw two lines through a given point, both of which will be parallel to a given line. The drawing Of these lines led to the concept of the curvature Of space, and this to the idea of higher Space.<br><br>About the Publisher<br><br>Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com<br><br>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.