Definition
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[0R8] Given a metric space \((M,d)\), given \(Aβ M\) non-empty, we define the distance function \(d_ A:Mβ β\) as
\begin{equation} d_ A(x)=\inf _{yβ A} d(x,y)~ .\label{eq:funz_ distanza} \end{equation}
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EDB β 0R8
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