follows from the fact that when we look at the wave equation from the calculus of variations standpoint, we know that in the neighborhood of the correct "Eigenfunktion" 4A and the correct "Eigenwerte" E, bE = 0 for any 34,.Incidentally, this also indicates why the Ritz method seems to be a particularly powerful one in calculating the approximate energy values of the wave equation.
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J. Robert Oppenheimer (1927) studied this question.
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