2. Fourier inversion formula

2.1 Identity approximations

The Banach algebra $L^{1} (ℝ)$ is not unitary, because if there existed $u \in L^{1} (ℝ)$ such that f $*$ u = f ,

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Fourier inversion formula

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(1) - DYM (H.), MC KEAN (H.P.) - Fourier Series and Integrals. - Academic Press 1972.
(2) - FOLLAND (G.) - Introduction to partial differential equations. - Princeton University Press 1976.
(3)...

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