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math.GR2015
Strongly aperiodic subshifts on surface groups
David Bruce Cohen, Chaim Goodman-Strauss
We give strongly aperiodic subshifts of finite type on every hyperbolic surface group; more generally, for each pair of expansive primitive symbolic substitution systems with incom…
math.FA2015★ 4 cited
Dilations of matricies
David Cohen
We explore aspects of dilation theory in the finite dimensional case and show that for a commuting -tuple of operators acting on some finite dimensional Hilbe…