MAYBE 0.08/0.18 MAYBE 0.08/0.18 0.08/0.18 Problem: 0.08/0.18 +(0(),y) -> y 0.08/0.18 +(s(x),y) -> s(+(x,y)) 0.08/0.18 *(x,0()) -> 0() 0.08/0.18 *(x,s(y)) -> +(x,*(x,y)) 0.08/0.18 twice(0()) -> 0() 0.08/0.18 twice(s(x)) -> s(s(twice(x))) 0.08/0.18 -(x,0()) -> x 0.08/0.18 -(s(x),s(y)) -> -(x,y) 0.08/0.18 f(s(x)) -> f(-(*(s(s(x)),s(s(x))),+(*(s(x),s(s(x))),s(s(0()))))) 0.08/0.18 0.08/0.18 Proof: 0.08/0.18 Open 0.08/0.19 EOF