MAYBE 0.08/0.18 MAYBE 0.08/0.19 0.08/0.19 Problem: 0.08/0.19 minus(0(),y) -> 0() 0.08/0.19 minus(s(x),0()) -> s(x) 0.08/0.19 minus(s(x),s(y)) -> minus(x,y) 0.08/0.19 le(0(),y) -> true() 0.08/0.19 le(s(x),0()) -> false() 0.08/0.19 le(s(x),s(y)) -> le(x,y) 0.08/0.19 if(true(),x,y) -> x 0.08/0.19 if(false(),x,y) -> y 0.08/0.19 perfectp(0()) -> false() 0.08/0.19 perfectp(s(x)) -> f(x,s(0()),s(x),s(x)) 0.08/0.19 f(0(),y,0(),u) -> true() 0.08/0.19 f(0(),y,s(z),u) -> false() 0.08/0.19 f(s(x),0(),z,u) -> f(x,u,minus(z,s(x)),u) 0.08/0.19 f(s(x),s(y),z,u) -> if(le(x,y),f(s(x),minus(y,x),z,u),f(x,u,z,u)) 0.08/0.19 0.08/0.19 Proof: 0.08/0.19 Open 0.08/0.19 EOF