Abstract
The classical model examples of partial differential equations are:
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a)
Dirichletproblem (elliptic case):
$$\frac{{{\partial ^2}u}}{{\partial {x^2}}}\, + \,\frac{{{\partial ^2}u}}{{\partial {y^2}}}\, = \,f(x,y) in the domain B of the \left( {x,y} \right) - plane,\,$$((1))u (or ∂u/∂n in the so-called Neumann problem) given on the boundary of B.
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b)
Heat equation (parabolic case):
$$\frac{{\partial u}}{{\partial t}} = \frac{{{\partial ^2}u}}{{\partial {x^2}}}for a \leqslant x \leqslant b, t > 0,$$((2))$$u\left( {x,t} \right) given at t = 0 for all x,$$$$u or \partial u/\partial x given at x = a,x = b for all t.$$
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c)
Wave equation (hyperbolic case):
$$\frac{{{\partial ^2}u}}{{\partial {t^2}}}{\mkern 1mu} + {\mkern 1mu} \frac{{{\partial ^2}u}}{{\partial {x^2}}}for a \leqslant x \leqslant b, t > 0,$$((3))$$u and \partial u/\partial t given at t = 0 for all x,$$$$u or \partial u/\partial x given at x = a, x = b for all t.$$
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Rutishauser, H. (1990). Elliptic Partial Differential Equations, Relaxation Methods. In: Gutknecht, M. (eds) Lectures on Numerical Mathematics. Birkhäuser Boston. https://doi.org/10.1007/978-1-4612-3468-5_10
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DOI: https://doi.org/10.1007/978-1-4612-3468-5_10
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