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math.LO2026
Computable presentations of reduced group C*-algebras of groups with the rapid decay property
Isaac Goldbring
We show that whenever is a finitely generated group with the rapid decay property (property RD), then the norm on the reduced group C*-algebra is computable if (and…
math.LO2026
Computable presentations of reduced group C*-algebras of hyperbolic groups
Isaac Goldbring
Answering a question of Thomas Sinclair, we show that the standard presentation of the reduced group C*-algebra of an infinite hyperbolic group is computable. The ma…