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Necessary Conditions for Interpolation by Multivariate Polynomials

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Let $\Omega$ be a smooth, bounded, convex domain in $\mathbb R^n$ and let $\Lambda_k$ be a finite subset of $\Omega$. We find necessary geometric conditions for $\Lambda_k$ to be interpolating for the space of multivariate polynomials of degree at most $k$. Our results are asymptotic in $k$. The density conditions obtained match precisely the necessary geometric conditions that sampling sets are known to satisfy and they are expressed in terms of the equilibrium potential of the convex set. Moreover we prove that in the particular case of the unit ball, for $k$ large enough, there are no bases of orthogonal reproducing kernels in the space of polynomials of degree at most $k$.

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ANTEZANA, Jorge, MARZO SÁNCHEZ, Jordi and ORTEGA CERDÀ, Joaquim. Necessary Conditions for Interpolation by Multivariate Polynomials. Computational Methods And Function Theory. 2021. ISSN 1617-9447. [consulted: 13 of October of 2026]. Available at: https://hdl.handle.net/2445/179888

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