Transcription of Second Order Linear Partial Differential Equations Part I
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Second Order Linear Partial Differential Equations Part I
2008, 2012 Zachary S Tseng E 1 1 Second Order Linear Partial Differential Equations Part I Second Linear Partial Differential Equations ; Separation of Variables; 2 point boundary value problems; Eigenvalues and Eigenfunctions Introduction We are about to study a simple type of Partial Differential Equations (PDEs): the Second Order Linear PDEs. Recall that a Partial Differential equation is any Differential equation that contains two or more independent variables. Therefore the derivative(s) in the equation are Partial derivatives. We will examine the simplest case of Equations with 2 independent variables. A few examples of Second Order Linear PDEs in 2 variables are: 2 uxx = ut (one dimensional heat conduction equation) a2 uxx = utt (one dimensional wave equation) uxx + uyy = 0 (two dimensional Laplace/potential equation) In this class we will develop a method known as the method of Separation of Variables to solve the above types of Equations .
The general solution (that satisfies the boundary conditions) shall be solved from this system of simultaneous differential equations. Then the initial condition u(x, 0) = f (x) could be applied to find the particular solution.
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