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math.CA2015
Symmetric moment problems and a conjecture of Valent
Christian Berg, Ryszard Szwarc
In 1998 G. Valent made conjectures about the order and type of certain indeterminate Stieltjes moment problems associated with birth and death processes having polynomial birth and…
math.CA2015★ 3 cited
From Schoenberg coefficients to Schoenberg functions
Christian Berg, Emilio Porcu
In his seminal paper, Schoenberg (1942) characterized the class P(S^d) of continuous functions f:[-1,1] \to \R such that f(\cos θ) is positive definite over the product space S^d \…