Radial function ( $f (x) = g (∣ x ∣)$ )

A radial function depends only on the distance from the origin:

f (x) = g (∣ x ∣)

Δ f = g^{''} + (n - 1) g^{'} / r

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A radial function is a type of function that depends only on the distance from a central point, rather than on the direction.