MAYBE 0.08/0.18 MAYBE 0.08/0.18 0.08/0.18 Problem: 0.08/0.18 minus(x,0()) -> x 0.08/0.18 minus(s(x),s(y)) -> minus(x,y) 0.08/0.18 double(0()) -> 0() 0.08/0.18 double(s(x)) -> s(s(double(x))) 0.08/0.18 plus(0(),y) -> y 0.08/0.18 plus(s(x),y) -> s(plus(x,y)) 0.08/0.18 plus(s(x),y) -> plus(x,s(y)) 0.08/0.18 plus(s(x),y) -> s(plus(minus(x,y),double(y))) 0.08/0.18 0.08/0.18 Proof: 0.08/0.18 Open 0.08/0.18 EOF