Strict positive definiteness in geostatistics
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DOI: 10.1007/s00477-017-1432-x
Abstract: Geostatistical modeling is often based on the use of covariance functions, i.e., positive definite functions. However, when interpolation problems have to be solved, it is advisable to consider the subset of strictly positive definite functions.… read more here.
Keywords: positive definite; covariance functions; strictly positive; strict positive ... See more keywords
Characterization of Strict Positive Definiteness on products of complex spheres
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DOI: 10.1007/s11117-018-00641-5
Abstract: In this paper we consider Positive Definite functions on products $$\Omega _{2q}\times \Omega _{2p}$$Ω2q×Ω2p of complex spheres, and we obtain a condition, in terms of the coefficients in their disc polynomial expansions, which is necessary… read more here.
Keywords: products complex; definiteness products; complex spheres; characterization strict ... See more keywords