YES
Time: 0.012

Problem:
 Equations:
  
 TRS:
  joinAC(x,meetAC(x,y)) -> x
  meetAC(x,joinAC(x,y)) -> x

Proof:
 AC-RPO Processor:
  precedence:
   meetAC > joinAC
  status:
   
  problem:
   Equations:
    
   TRS:
    
  Qed