Transcription of ORDINARY DIFFERENTIAL EQUATIONS
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ORDINARY DIFFERENTIAL EQUATIONSGABRIEL NAGYM athematics Department,Michigan State University,East Lansing, MI, 16, is an introduction to ORDINARY DIFFERENTIAL EQUATIONS . We describe themain ideas to solve certain DIFFERENTIAL EQUATIONS , like first order scalar EQUATIONS , secondorder linear EQUATIONS , and systems of linear EQUATIONS . We use power series methodsto solve variable coefficients second order linear EQUATIONS . We introduce Laplace trans-form methods to find solutions to constant coefficients EQUATIONS with generalized sourcefunctions. We provide a brief introduction to boundary value problems, Sturm-Liouvilleproblems, and Fourier Series expansions. We end these notes solving our first partialdifferential equation, the Heat Equation. We use the method of separation of variables,hence solutions to the partial DIFFERENTIAL equation are obtained solving infinitely manyordinary DIFFERENTIAL NAGY ODE August 16, 2015 IContentsChapter 1.
substance at the time t. The di erential equation is du dt (t) = ku(t); where kis a positive constant. The equation says the higher the material concentration the faster it decays. (c) The Wave Equation: The wave equation describes waves propagating in a media. An example is sound, where pressure waves propagate in the air. The unknown is a scalar-
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