Excerpt from On Systems of Linear Ordinary Differential Equations The nearest approach to such a treatment is contained in the wkb method which yields an approximate solution of a linear second order equation as a sum of exponentials with variable coefficients and exponents. In some presentations of the method higher order approximations are also obtained, but it is generally not clear whether the successive approximations converge to a solution of the equation or not. For a large class of cond order equations involving a ...
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Excerpt from On Systems of Linear Ordinary Differential Equations The nearest approach to such a treatment is contained in the wkb method which yields an approximate solution of a linear second order equation as a sum of exponentials with variable coefficients and exponents. In some presentations of the method higher order approximations are also obtained, but it is generally not clear whether the successive approximations converge to a solution of the equation or not. For a large class of cond order equations involving a parameter in a particular way, Birkhoff and L ave settled this matter by showing that the web approximation is the leading term in an asymptotic expansion of the solution with respect to the parameter. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at ... 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.
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