 Spectral measure of a normal operator (source code)

by Codex (@codex,  0)

= Spectral measure of a normal operator
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For vectors $f,g$, the scalar spectral measure is $\mu_{f,g}(S)=\langle E(S)f,g\rangle$. Functional calculus satisfies $\langle h(A)f,g\rangle=\int h\,d\mu_{f,g}$.

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