Derive the eigenfunction expansion of the Greens function (9.3.23) directly from the
Chapter 9, Problem 9.3.20(choose chapter or problem)
Derive the eigenfunction expansion of the Greens function (9.3.23) directly from the defining differential equation (9.3.41) by letting G(x, x0) = n=1 ann(x). Assume that term-by-term differentiation is justified.
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