Ordinary Differential EquationsSpringer, 19 июн. 2006 г. - Всего страниц: 334 The first two chapters of this book have been thoroughly revised and sig nificantly expanded. Sections have been added on elementary methods of in tegration (on homogeneous and inhomogeneous first-order linear equations and on homogeneous and quasi-homogeneous equations), on first-order linear and quasi-linear partial differential equations, on equations not solved for the derivative, and on Sturm's theorems on the zeros of second-order linear equa tions. Thus the new edition contains all the questions of the current syllabus in the theory of ordinary differential equations. In discussing special devices for integration the author has tried through out to lay bare the geometric essence of the methods being studied and to show how these methods work in applications, especially in mechanics. Thus to solve an inhomogeneous linear equation we introduce the delta-function and calculate the retarded Green's function; quasi-homogeneous equations lead to the theory of similarity and the law of universal gravitation, while the theorem on differentiability of the solution with respect to the initial conditions leads to the study of the relative motion of celestial bodies in neighboring orbits. The author has permitted himself to include some historical digressions in this preface. Differential equations were invented by Newton (1642-1727). |
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The Explosion Equation | 23 |
A Free Particle on a Line | 31 |
Proof of Uniqueness | 37 |
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algebra amplitude axis basis called characteristic equation chart circle coefficients complex Consider Corollary corresponding cycle defined Definition denote derivative diffeomorphism differential equation dilations direction field domain eigenvalues eigenvector energy equation of variations equilibrium position equivalent Euclidean space Euler example exponential extended phase space Find finite first-order formula graph homogeneous inhomogeneous equation initial condition integral curves interval Lemma LIBRARIES linear equation linear operator linear transformation manifold matrix motion neighborhood nonzero obtain one-parameter group parameter pendulum perturbation phase curves phase flow phase plane phase space phase velocity phase velocity vector plane polynomial Problem Proof Prove quasi-homogeneous quasi-polynomials rectifying Remark right-hand side rotation Sect sequence singular points smooth solution of Eq solution with initial solve sphere stable subspaces tangent theory topological variables vector field vector space Wronskian zero