YES
Time: 0.000931
TRS:
 {  fib 0() -> 0(),
  fib s 0() -> s 0(),
  fib s s x -> +(fib s x, fib x)}
 DP:
  DP:
   {fib# s s x -> fib# x,
    fib# s s x -> fib# s x}
  TRS:
  {  fib 0() -> 0(),
   fib s 0() -> s 0(),
   fib s s x -> +(fib s x, fib x)}
  EDG:
   {(fib# s s x -> fib# x, fib# s s x -> fib# s x)
    (fib# s s x -> fib# x, fib# s s x -> fib# x)
    (fib# s s x -> fib# s x, fib# s s x -> fib# x)
    (fib# s s x -> fib# s x, fib# s s x -> fib# s x)}
   SCCS (1):
    Scc:
     {fib# s s x -> fib# x,
      fib# s s x -> fib# s x}
    SCC (2):
     Strict:
      {fib# s s x -> fib# x,
       fib# s s x -> fib# s x}
     Weak:
     {  fib 0() -> 0(),
      fib s 0() -> s 0(),
      fib s s x -> +(fib s x, fib x)}
     SPSC:
      Simple Projection:
       pi(fib#) = 0
      Strict:
       {fib# s s x -> fib# s x}
      EDG:
       {(fib# s s x -> fib# s x, fib# s s x -> fib# s x)}
       SCCS (1):
        Scc:
         {fib# s s x -> fib# s x}
        SCC (1):
         Strict:
          {fib# s s x -> fib# s x}
         Weak:
         {  fib 0() -> 0(),
          fib s 0() -> s 0(),
          fib s s x -> +(fib s x, fib x)}
         SPSC:
          Simple Projection:
           pi(fib#) = 0
          Strict:
           {}
          Qed