MAYBE 0.08/0.18 MAYBE 0.08/0.18 0.08/0.18 Problem: 0.08/0.18 minus(x,y) -> cond(gt(x,y),x,y) 0.08/0.18 cond(false(),x,y) -> 0() 0.08/0.18 cond(true(),x,y) -> s(minus(x,s(y))) 0.08/0.18 gt(0(),v) -> false() 0.08/0.18 gt(s(u),0()) -> true() 0.08/0.18 gt(s(u),s(v)) -> gt(u,v) 0.08/0.18 0.08/0.18 Proof: 0.08/0.18 Open 0.08/0.18 EOF