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composition operator : ウィキペディア英語版
composition operator

In mathematics, the composition operator C_\phi with symbol \phi is a linear operator defined by the rule
:C_\phi (f) = f \circ\phi
where f \circ\phi denotes function composition.
The study of composition operators is covered by (AMS category 47B33 ).
==In physics==
In physics, and especially the area of dynamical systems, the composition operator is usually referred to as the Koopman operator,〔B.O. Koopman, "Hamiltonian systems and transformations in Hilbert space", (1931) ''Proceedings of the National Academy of Sciences of the USA'', 17, pp.315-318.〕〔Pierre Gaspard, ''Chaos, scattering and statistical mechanics'', (1998) Cambridge University Press〕 named after Bernard Koopman. It is the left-adjoint of the Frobenius-Perron or transfer operator.

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