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On the complete solution of the Sturm–Liouville problem (d[sup 2]X/dx[sup 2])+λ[sup 2]X=0 over a closed interval
Journal of Mathematical Physics
We discuss the sets of orthogonal functions that form solutions to the Sturm-Liouville problem for the equation d 2 X/dx 2 ϩ 2 Xϭ0 and for the general unmixed boundary conditions over a closed interval of the variable x. The conditions for the presence of the solutions with 2 р0 are specifically considered and their necessity for completeness of a set of eigenfunctions. Their implications are discussed for three examples from mathematical physics, showing that although for some problems thedoi:10.1063/1.1459753 fatcat:cy4gglt42nak7auon5bjiqlq2e