Excerpt from Cascading Divide-and-Conquer: A Technique for Designing Parallel Algorithms Visibility from a Point: Given n line segments such that no two intersect (except possibly at endpoints) and a point p, determine that part of the plane visible from p if all the segments are opaque. A (log nlog log n, u) solution was given in We improve this to (log n, u). 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.