Excerpt from Mathematical Questions, With Their Solutions, From the "Educational Times," Vol. 41: With Many Papers and Solutions Not Published in the "Educational Times" 4925. (the late Professor Clifford, - Let U, V, W 0 be the point equations, and u, o, w 0 the plane-equations of three quadrics inscribed in the same developable, and let u o to be identically zero. Then, if a tangent plane to U, a tangent plane to V, and a tan gent plane to W, are mutually conjugate in respect of on 512 ]690 0. 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.