Harmonic Properties of Schwarz Functions
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Theorem
Let $f, g : \R \to \C$ be Schwarz functions.
Let $\hat f$, $\hat g$ be the Fourier transforms of $f$ and $g$ respectively.
Then:
- $(1): \quad \hat f$, $\hat g$ are Schwarz functions.
- $(2): \quad \map {\widehat {\paren {\hat f} } } x = \map f {-x}$ for all $x \in \R$.
- $(3): \quad$ If $f * g$ is the convolution of $f$ and $g$, then:
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- $\widehat {f * g} = \hat f \hat g$
Proof
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