Emergent Mind
Gaussian kernels on non-simply-connected closed Riemannian manifolds are never positive definite
(2303.06558)
Published Mar 12, 2023
in
math.DG
,
cs.LG
,
math.FA
,
math.ST
,
and
stat.TH
Abstract
We show that the Gaussian kernel $\exp\left{-\lambda dg2(\bullet, \bullet)\right}$ on any non-simply-connected closed Riemannian manifold $(\mathcal{M},g)$, where $dg$ is the geodesic distance, is not positive definite for any $\lambda > 0$, combining analyses in the recent preprint~[9] by Da Costa--Mostajeran--Ortega and classical comparison theorems in Riemannian geometry.
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