YES O(n^2) TRS: { or(x, x) -> x, and(x, x) -> x, not(or(x, y)) -> and(not(x), not(y)), not(and(x, y)) -> or(not(x), not(y)), not(not(x)) -> x } DUP: We consider a non-duplicating system. Trs: { or(x, x) -> x, and(x, x) -> x, not(or(x, y)) -> and(not(x), not(y)), not(and(x, y)) -> or(not(x), not(y)), not(not(x)) -> x } Matrix Interpretation: Interpretation class: triangular [X1] [1 3][X1] [2] [not]([X0]) = [0 1][X0] + [0] [X3] [X1] [1 2][X3] [1 1][X1] [2] [and]([X2], [X0]) = [0 1][X2] + [0 1][X0] + [1] [X3] [X1] [1 2][X3] [1 1][X1] [2] [or]([X2], [X0]) = [0 1][X2] + [0 1][X0] + [1] Qed