MAYBE
Time: 0.007

Problem:
 Equations:
  
 TRS:
  pAC(x,zero()) -> x
  pAC(i(x),x) -> zero()
  m(z,pAC(x,y)) -> pAC(m(z,x),m(z,y))
  m(pAC(x,y),z) -> pAC(m(x,z),m(y,z))

Proof:
 Open