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Whether such a layer stays orientationally ordered over large distances, or activity always creates enough defects to destroy the order, is disputed.","posed_since":"","precise":"In $2\\mathrm{D}$ dry active nematics (no momentum conservation, e.g. Chate-Ginelli-Montagne-type particle models), determine whether the ordered phase has quasi-long-range orientational order with algebraically decaying correlations, or whether activity unbinds $+1/2$ and $-1/2$ disclinations at any finite activity so that order is lost beyond a finite length. An answer gives the asymptotic form of the orientational correlation function and the defect density versus system size.","problem_ref":"073fe63cc8ce83edfa9dd5d85ca5a5bbcc22810208930719e12ee3dcb8ea287a","references":"","settled_by":"Simulations over several decades of system size measuring orientational correlations and defect density, together with a renormalization-group treatment including defects.","status_note":"","title":"Do two-dimensional dry active nematics keep quasi-long-range 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