= Operator formalism
The <operator formalism> describes a quantum system using states in a <Hilbert space> and observables represented by <self-adjoint operators> with suitable domains on that <Hilbert space>. Evolution and correlation functions are computed from <Hamiltonian operators> and their <time-ordered products>. For free <quantized fields>, the oscillator construction gives a <Fock space>. The <operator-path-integral equivalence> relates these matrix elements to integrals over field histories.
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