If we let Llx and Lly approach zero, we obtain the PDE of
Chapter 12, Problem 12.7(choose chapter or problem)
If we let Llx and Lly approach zero, we obtain the PDE of the model (3) p This PDE is called the two-dimensional wave equation. The expression in parentheses is the Laplacian V2 u of u (Sec. 10.8). Hence (3) can be written (3') Solutions of the wave equation (3) will be obtained and discussed in the next section.
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