MAYBE
Time: 0.008

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

Proof:
 Open