By Matthew P. Coleman

Advent What are Partial Differential Equations? PDEs we will be able to Already remedy preliminary and Boundary stipulations Linear PDEs-Definitions Linear PDEs-The precept of Superposition Separation of Variables for Linear, Homogeneous PDEs Eigenvalue difficulties the large 3 PDEsSecond-Order, Linear, Homogeneous PDEs with consistent CoefficientsThe warmth Equation and Diffusion The Wave Equation and the Vibrating String InitialRead more...

summary: advent What are Partial Differential Equations? PDEs we will Already remedy preliminary and Boundary stipulations Linear PDEs-Definitions Linear PDEs-The precept of Superposition Separation of Variables for Linear, Homogeneous PDEs Eigenvalue difficulties the massive 3 PDEsSecond-Order, Linear, Homogeneous PDEs with consistent CoefficientsThe warmth Equation and Diffusion The Wave Equation and the Vibrating String preliminary and Boundary stipulations for the warmth and Wave EquationsLaplace's Equation-The power Equation utilizing Separation of Variables to unravel the massive 3 PDEs Fourier sequence advent

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**Additional resources for An Introduction to Partial Differential Equations with MATLAB, Second Edition**

**Sample text**

6 19 Separation of Variables for Linear, Homogeneous PDEs In the mid-1700s, Daniel Bernoulli and, later, Jean le Rond d’Alembert experimented with a new technique for producing solutions of linear, homogeneous PDEs. This method, called separation of variables,§ entails the reduction of a PDE to an ODE (or, more commonly, to a number of ODEs, each corresponding to a diﬀerent independent variable), a recurrent theme in the study of PDEs. 4 Given a PDE in u = u(x, y), we say that u is a product solution if u(x, y) = f (x)g(y) for functions f and g.

5 In Exercises 1–4, verify directly that the principle of superposition holds for any two solutions, u1 and u2 , of the given PDE. 1. yux − x2 uy + 2u = 0 An Introduction to Partial Diﬀerential Equations with MATLAB R 18 2. The heat equation in two space variables, ut = α2 (uxx + uyy ) 3. Laplace’s equation in three space variables, uxx + uyy + uzz = 0 4. The wave equation in three space variables, utt + c2 (uxx + uyy + uzz ) = 0 ∞ 5. 12) to show that the function u(x, t) = 2 cn e−n t sin nx is a n=1 solution of the heat equation ut = uxx (whenever the series converges, of course).

2uy − 5u3 = x 4. uxx = sin u 5. The three-dimensional heat equation, ut = α2 (uxx + uyy + uzz ), where α2 is a constant. 6. Poisson’s equation is two dimensions (in polar coordinates), 1 1 urr + ur + 2 uθθ = f (r, θ). r r 7. 3 1 + x2 y 2 uxyy − cos(xy 3 )uxxy + e−y ux − (5x2 − 2xy + 3y 2 )u = 0 An Introduction to Partial Diﬀerential Equations with MATLAB R 16 8. 10). ∂ 9. We know from calculus (and from Exercise 8) that ∂x (c1 u1 + c2 u2 ) = c1 u1x + c2 u2x , for all constants c1 and c2 and all diﬀerentiable functions u (and that the same is true not only for x but, of course, for any independent variable).