YES Problem: not(not(x)) -> x not(or(x,y)) -> and(not(not(not(x))),not(not(not(y)))) not(and(x,y)) -> or(not(not(not(x))),not(not(not(y)))) Proof: DP Processor: DPs: not#(or(x,y)) -> not#(y) not#(or(x,y)) -> not#(not(y)) not#(or(x,y)) -> not#(not(not(y))) not#(or(x,y)) -> not#(x) not#(or(x,y)) -> not#(not(x)) not#(or(x,y)) -> not#(not(not(x))) not#(and(x,y)) -> not#(y) not#(and(x,y)) -> not#(not(y)) not#(and(x,y)) -> not#(not(not(y))) not#(and(x,y)) -> not#(x) not#(and(x,y)) -> not#(not(x)) not#(and(x,y)) -> not#(not(not(x))) TRS: not(not(x)) -> x not(or(x,y)) -> and(not(not(not(x))),not(not(not(y)))) not(and(x,y)) -> or(not(not(not(x))),not(not(not(y)))) Matrix Interpretation Processor: dimension: 1 interpretation: [not#](x0) = x0 + 1, [and](x0, x1) = x0 + x1 + 1, [or](x0, x1) = x0 + x1 + 1, [not](x0) = x0 orientation: not#(or(x,y)) = x + y + 2 >= y + 1 = not#(y) not#(or(x,y)) = x + y + 2 >= y + 1 = not#(not(y)) not#(or(x,y)) = x + y + 2 >= y + 1 = not#(not(not(y))) not#(or(x,y)) = x + y + 2 >= x + 1 = not#(x) not#(or(x,y)) = x + y + 2 >= x + 1 = not#(not(x)) not#(or(x,y)) = x + y + 2 >= x + 1 = not#(not(not(x))) not#(and(x,y)) = x + y + 2 >= y + 1 = not#(y) not#(and(x,y)) = x + y + 2 >= y + 1 = not#(not(y)) not#(and(x,y)) = x + y + 2 >= y + 1 = not#(not(not(y))) not#(and(x,y)) = x + y + 2 >= x + 1 = not#(x) not#(and(x,y)) = x + y + 2 >= x + 1 = not#(not(x)) not#(and(x,y)) = x + y + 2 >= x + 1 = not#(not(not(x))) not(not(x)) = x >= x = x not(or(x,y)) = x + y + 1 >= x + y + 1 = and(not(not(not(x))),not(not(not(y)))) not(and(x,y)) = x + y + 1 >= x + y + 1 = or(not(not(not(x))),not(not(not(y)))) problem: DPs: TRS: not(not(x)) -> x not(or(x,y)) -> and(not(not(not(x))),not(not(not(y)))) not(and(x,y)) -> or(not(not(not(x))),not(not(not(y)))) Qed