A survey of dimension-free entrywise positivity preservers with links to metric embeddings, Schur polynomials, finite fields, and an appendix on sphere packings via Schoenberg's theorem.
The minimum value of quadratic forms, and the closest packing of spheres
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The entrywise calculus and dimension-free positivity preservers, with an Appendix on sphere packings
A survey of dimension-free entrywise positivity preservers with links to metric embeddings, Schur polynomials, finite fields, and an appendix on sphere packings via Schoenberg's theorem.