= Double operator integral
{wiki=Double_operator_integral}
The double operator integral is a mathematical concept that arises in the context of functional analysis and operator theory. It extends the notion of integration to the setting of operators acting on Hilbert spaces or Banach spaces. In traditional calculus, we can define integrals over functions; in the case of operator integrals, we can think of integrating over operators. The double operator integral involves integrating two operator-valued functions with respect to a measure.
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