Toeplitz operator

Toeplitz operator

In operator theory, a Toeplitz operator is the compression of a multiplication operator on the circle to the Hardy space.

Details

Let "S"1 be the circle, with the standard Lebesgue measure, and "L"2("S"1) be the Hilbert space of square-integrable functions. A bounded measurable function "g" on "S"1) defines a multiplication operator "Mg" on "L"2("S"1). Let "P" be the projection from "L"2("S"1) onto the Hardy space "H"2. The "Toeplitz operator with symbol g" is defined by

:T_g = P M_g mid_{H^2},

where " | " means restriction.

A bounded operator on "H"2 is Toeplitz if and only if its matrix representation, in the basis {"zn", "n" ≥ 0}, has constant diagonals.

References


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