I have a radial basis function with a linear kernel $f(r)=r$ in $3D.$ I constructed the surface based on this RBF and noticed that the absolute value of actual distance from any point to the constructed surface is always greater than the absolute value that is returned for this point by RBF. Can this fact be proved?
2026-03-31 16:26:40.1774974400
Absolute value of an RBF distance is less than the absolute value of an actual distance
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