= Functional calculus
{wiki=Functional_calculus}
Functional calculus is a mathematical framework that extends the notion of functions applied to real or complex numbers to functions applied to linear operators, particularly in the context of functional analysis and operator theory. It allows mathematicians and physicists to manipulate operators (usually bounded or unbounded linear operators on a Hilbert space) using functions. This methodology is particularly useful in quantum mechanics and other fields involving differential operators.
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