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21.127 (2026)

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Let $G$ be a right-angled Artin group. Is the stable commutator length $\text{scl}(g)$ a rational number for every $g \in [G, G]$? For free groups this is true by Calegari’s Rationality Theorem. (See 18.40 for the definition of $\text{scl}(g)$.)

Contributor: I. Soroko

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