MAYBE

Problem:
 div(x,s(y)) -> d(x,s(y),0())
 d(x,s(y),z) -> cond(ge(x,z),x,y,z)
 cond(true(),x,y,z) -> s(d(x,s(y),plus(s(y),z)))
 cond(false(),x,y,z) -> 0()
 ge(u,0()) -> true()
 ge(0(),s(v)) -> false()
 ge(s(u),s(v)) -> ge(u,v)
 plus(n,0()) -> n
 plus(n,s(m)) -> s(plus(n,m))

Proof:
 Open