I have read that the eigenfunctions of a Sturm-Liouville operator form an orthonormal basis, can someone give me a reference to the proof of this proposition? Thanks in advance
2026-03-29 22:37:25.1774823845
Reference Request for a theorem in Sturm-Liouville theory
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Here's a link:
https://www.amazon.com/Sturm-Liouville-Theory-Anton-Zettl/dp/0821852671/ref=sr_1_1?dchild=1&keywords=sturm-liouville+theory&qid=1619756533&sr=8-1
This is a well-regarded text on the subject of Sturm-Liouville Theory.