Positive-definite function: Difference between revisions

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Disambiguate the definition in dynamic systems versus the most common contexts in machine learning, statistics, and pure math.
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In this context, one does not usually use Fourier terminology and instead one states that ''f(x)'' is the [[characteristic function (probability theory)|characteristic function]] of a [[symmetric]] [[probability density function|PDF]].
 
===GeneralisationGeneralization===
{{main|Positive-definite function on a group}}