Theorem: For every Hermitian operator, there exists at least one basis consisting of its orthonormal eigen vectors. It is diagonal in this basis and has its eigenvalues as its diagonal entries.(adsbygoogle = window.adsbygoogle || []).push({});

The theory is apparently making an assumption that every Hermitian operator must have eigen values/vectors. Am I missing something here? Should ALL hermitian operators have eigen values/vectors?

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# Question about hermitian operators

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