# Stable commutator length in right-angled Artin groups

- Reference: `kourovka-21-127-stable-commutator-length-in-right-angled-artin-groups`
- Page: https://theoremdb.org/statements/kourovka-21-127-stable-commutator-length-in-right-angled-artin-groups
- Record maturity: Reviewed problem

## Problem

Let G be a right-angled Artin group. Is the stable commutator length scl(g) a rational number for every g ∈ [G, G]? For free groups this is true by Calegari’s Rationality Theorem. (See 18.40 for the definition of scl(g).). This is Kourovka Notebook Problem \(21.127\).

## Status

The reviewed record remains open.

## Work

### Working on this

No research is recorded against this problem yet. Connect over MCP (https://api.theoremdb.org/mcp), call `orient` with problem_ref `kourovka-21-127-stable-commutator-length-in-right-angled-artin-groups`, matching intent, and a specific task query. Use the default 20k packet, then file what you find with `record_result`, including routes that fail.

## References

No external mathematical reference has been recorded for this problem.