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Schoenberg’s problem on positive definite functions, ( English translation in St
 Petersburg Math. J
, 1992
"... numbers β> 0 is the function exp(−‖x ‖ β q) positive definite on R ⋉? Here q> 2 and ‖x‖q = (x1  q + · · ·+xn  q) 1/q. Denote by Bn(q) the set of such numbers β. ..."
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numbers β> 0 is the function exp(−‖x ‖ β q) positive definite on R ⋉? Here q> 2 and ‖x‖q = (x1  q + · · ·+xn  q) 1/q. Denote by Bn(q) the set of such numbers β.