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math.OA2026
Partial actions of free groups and groupoid homology
Benjamin Steinberg
We give a length one projective resolution of the trivial module for the groupoid of a semi-saturated partial action (in the sense of Exel) of a free group on a compact Hausdorff a…
math.GR2026
A short proof of a bound on the size of finite irreducible semigroups of rational matrices
Benjamin Steinberg
I give a short proof of a recent result due to Kiefer and Ryzhikov showing that a finite irreducible semigroup of matrices has cardinality at most .