Post Closed as "not a real question" by Alain Valette, Qiaochu Yuan, Yemon Choi, Mark Meckes, Andy Putman

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Eigenvalues of infinite matrices

I am trying to find some literature on infinite matrices because I want to know how to get the eigenvalues of infinite matrices. Seriously, it seems there are very few references available. Can someone tell me how to determine the spectrum of infinite matrices?