Definition of "self-adjoint" [self-adjoint]

• Which is adjoint to itself (adjective)

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• "There remains to recover, e.g., the representation of “observables” by self-adjoint operators, and the dynamics (unitary evolution)."
• "Each bounded simple random variable f gives rise to a bounded self-adjoint operator A ="
• "It is not difficult to show that a self-adjoint operator P with spectrum contained in the two-point set {0,1} must be a projection; i.e.,"