(a) Show that the Green function G(x, y; x', y?) appropriate for Dirichlet boundary conditions for a...

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(a) Show that the Green function G(x, y; x', y?) appropriate for Dirichlet boundary conditions for a square two-dimensional region, 0 ? x ? l, 0 ? y ? l, has an expansion

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Where gn(y, ?y?) satisfies

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(b) Taking for gn(y, y') appropriate linear combinations of sinh(n?y') and cosh(n?y') in the two regions, ?' ?, in accord with the boundary conditions and the discontinuity in slope required by the source delta function, show that the explicit form of G is

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Where y(y>) is the smaller (larger) of ? and y'.

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