YES O(n^2) TRS: {app(app(app(compose(), f), g), x) -> app(f, app(g, x))} DUP: We consider a non-duplicating system. Trs: {app(app(app(compose(), f), g), x) -> app(f, app(g, x))} Matrix Interpretation: Interpretation class: triangular [0] [compose] = [1] [X3] [X1] [1 1][X3] [1 0][X1] [0] [app]([X2], [X0]) = [0 1][X2] + [0 1][X0] + [1] Qed