ABSTRACT
In the last chapter, we inverted the Stürm - Liouville differential operator to obtain the inverse in the case where λ was not an eigenvalue. We can now determine the eigenfunctions of this operator form a complete orthonormal set in the Hilbert Space L2([a,b])https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315166209/ca8d5048-0ada-4280-9f99-fd3bb3017999/content/ieq2338.tif"/>.
