Naimark's Theorem
The theorem reads as follows: Let E be a positive L(H)-valued measure on X. There exists a Hilbert space K, a bounded operator, and a self-adjoint, spectral L(K)-valued measure on X, F, such that
Read more about this topic: Naimark's Dilation Theorem
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“To insure the adoration of a theorem for any length of time, faith is not enough, a police force is needed as well.”
—Albert Camus (1913–1960)