Excerpt from Introduction to Non-Linear Mechanics: Topological Methods, Analytical Methods, Non-Linear Resonance, Relaxation Oscillations The spring constant in this case does not remain constant but diminishes with increasing 9. In this manner we obtain a more nearly correct representation of the motion. By retaining a greater number of terms in the power expansion of sin 0 we obtain still greater accuracy but the problem becomes more com plicated. In practice even the first approximation [3] gives an error of less than 1 per cent for angles of the order of 30 degrees. 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.