85 citations · 210 across the 20 of their papers we have counts for
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math.GR2009★ 5 cited
Schur Multipliers and Spherical Functions on Homogeneous Trees
Uffe Haagerup, Troels Steenstrup, Ryszard Szwarc
Let X be a homogeneous tree of degree q+1 (for q between 2 and infinity) and let f be a complex function on X times X for which f(x,y) only depend on the distance between x and y i…
math.CA2009★ 52 cited
The smallest eigenvalue of Hankel matrices
Christian Berg, Ryszard Szwarc
Let H_N=(s_{n+m}),n,m\le N denote the Hankel matrix of moments of a positive measure with moments of any order. We study the large N behaviour of the smallest eigenvalue lambda_N o…
math.FA2009
Jacobi matrices on trees
Agnieszka M. Kazun, Ryszard Szwarc
Symmetric Jacobi matrices on one sided homogeneous trees are studied. Essential selfadjointness of these matrices turns out to depend on the structure of the tree. If a tree has on…