Schoenberg matrices of radial positive definite functions and Riesz sequences in $L^2({\mathbb{R}}^n)$

L. Golinskii, M. Malamud, L. Oridoroga

Given a function $f$ on the positive half-line ${\mathbb{R}}_{+}$ and a sequence (finite or infinite) of points $X=\{x_k{\}}_{k=1}^{\omega }$ in ${\mathbb{R}}^n$, we define and study matrices $\kS_X(f)=\|f(|x_i-x…