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I was reading the Wiki page on the Sturm-Liouville theory. Why are those tenets true? Are there any (not too advanced) reference material?

I have also read that

"There are countably infinite number of eigenvalues which satisfy the self-adjoint problem due to the property of completeness." -- someone's old notes

Firstly, why is the property of completeness true?

Secondly, why is this quoted statement true?

Thanks

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    A very nice introductory reference for the topic is "Fourier Series and Orthogonal Functions" by Harry Davis, of Dover publications. I think they have a Kindle edition now. Cheers. Juan Pablo2013-09-06

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