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- Title
Gneiting Class, Semi-Metric Spaces and Isometric Embeddings.
- Authors
MENEGATTO, VALDIR A.; OLIVEIRA, CLAUDEMIR P.; PORCU, EMILIO
- Abstract
This paper revisits the Gneiting class of positive definite kernels originally proposed as a class of covariance functions for space-time processes. Under the framework of quasi-metric spaces and isometric embeddings, the paper proposes a general and unifying framework that encompasses results provided by earlier literature. Our results allow to study the positive definiteness of the Gneiting class over products of either Euclidean spaces or high dimensional spheres and quasi-metric spaces. In turn, Gneiting's theorem is proved here by a direct construction, eluding Fourier inversion (the so-called Gneiting's lemma) and convergence arguments that are required by Gneiting to preserve an integrability assumption.
- Subjects
QUASI-metric spaces; MATHEMATICS education; MATHEMATICS theorems; EUCLIDEAN geometry; ISOMETRICS (Mathematics)
- Publication
Constructive Mathematical Analysis, 2020, Vol 3, Issue 2, p85
- ISSN
2651-2939
- Publication type
Article
- DOI
10.33205/cma.712049