Therefore we can ask for an equivalent characterization of a strictly positive definite function in terms of its Fourier transform… and writing ν as a linear combination of finite positive measures, we get via the inverse Fourier transform that γ = ∑ j = 1 4 C j f j ω with C j ∈ C and f j ∈ C u (G) positive definite. First, we show that Wronskians of the Fourier transform of a nonnegative function on $\mathbb{R}$ are positive definite functions and the Wronskians of the Laplace transform of a nonnegative function on $\mathbb{R}_+$ are completely monotone functions. A necessary and sufficient condition that u(x, y)ÇzH, GL, èO/or -í

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