96 citations · 190 across the 18 of their papers we have counts for
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math.GR2015
On operator norms for hyperbolic groups
Bogdan Nica
We estimate the operator norm of radial non-negative functions on hyperbolic groups. As a consequence, we show that several forms of Haagerup's inequality are optimal.
math.CO2015★ 1 cited
Unimodular graphs and Eisenstein sums
Bogdan Nica
Motivated in part by combinatorial applications to certain sum-product phenomena, we introduce unimodular graphs over finite fields and, more generally, over finite valuation rings…