MAYBE

Problem:
 min(0(),y) -> 0()
 min(x,0()) -> 0()
 min(s(x),s(y)) -> s(min(x,y))
 max(0(),y) -> y
 max(x,0()) -> x
 max(s(x),s(y)) -> s(max(x,y))
 twice(0()) -> 0()
 twice(s(x)) -> s(s(twice(x)))
 -(x,0()) -> x
 -(s(x),s(y)) -> -(x,y)
 p(s(x)) -> x
 f(s(x),s(y)) -> f(-(max(s(x),s(y)),min(s(x),s(y))),p(twice(min(x,y))))

Proof:
 DP Processor:
  DPs:
   min#(s(x),s(y)) -> min#(x,y)
   max#(s(x),s(y)) -> max#(x,y)
   twice#(s(x)) -> twice#(x)
   -#(s(x),s(y)) -> -#(x,y)
   f#(s(x),s(y)) -> min#(x,y)
   f#(s(x),s(y)) -> twice#(min(x,y))
   f#(s(x),s(y)) -> p#(twice(min(x,y)))
   f#(s(x),s(y)) -> min#(s(x),s(y))
   f#(s(x),s(y)) -> max#(s(x),s(y))
   f#(s(x),s(y)) -> -#(max(s(x),s(y)),min(s(x),s(y)))
   f#(s(x),s(y)) -> f#(-(max(s(x),s(y)),min(s(x),s(y))),p(twice(min(x,y))))
  TRS:
   min(0(),y) -> 0()
   min(x,0()) -> 0()
   min(s(x),s(y)) -> s(min(x,y))
   max(0(),y) -> y
   max(x,0()) -> x
   max(s(x),s(y)) -> s(max(x,y))
   twice(0()) -> 0()
   twice(s(x)) -> s(s(twice(x)))
   -(x,0()) -> x
   -(s(x),s(y)) -> -(x,y)
   p(s(x)) -> x
   f(s(x),s(y)) -> f(-(max(s(x),s(y)),min(s(x),s(y))),p(twice(min(x,y))))
  TDG Processor:
   DPs:
    min#(s(x),s(y)) -> min#(x,y)
    max#(s(x),s(y)) -> max#(x,y)
    twice#(s(x)) -> twice#(x)
    -#(s(x),s(y)) -> -#(x,y)
    f#(s(x),s(y)) -> min#(x,y)
    f#(s(x),s(y)) -> twice#(min(x,y))
    f#(s(x),s(y)) -> p#(twice(min(x,y)))
    f#(s(x),s(y)) -> min#(s(x),s(y))
    f#(s(x),s(y)) -> max#(s(x),s(y))
    f#(s(x),s(y)) -> -#(max(s(x),s(y)),min(s(x),s(y)))
    f#(s(x),s(y)) -> f#(-(max(s(x),s(y)),min(s(x),s(y))),p(twice(min(x,y))))
   TRS:
    min(0(),y) -> 0()
    min(x,0()) -> 0()
    min(s(x),s(y)) -> s(min(x,y))
    max(0(),y) -> y
    max(x,0()) -> x
    max(s(x),s(y)) -> s(max(x,y))
    twice(0()) -> 0()
    twice(s(x)) -> s(s(twice(x)))
    -(x,0()) -> x
    -(s(x),s(y)) -> -(x,y)
    p(s(x)) -> x
    f(s(x),s(y)) -> f(-(max(s(x),s(y)),min(s(x),s(y))),p(twice(min(x,y))))
   graph:
    f#(s(x),s(y)) -> f#(-(max(s(x),s(y)),min(s(x),s(y))),p(twice(min(x,y)))) ->
    f#(s(x),s(y)) -> f#(-(max(s(x),s(y)),min(s(x),s(y))),p(twice(min(x,y))))
    f#(s(x),s(y)) -> f#(-(max(s(x),s(y)),min(s(x),s(y))),p(twice(min(x,y)))) ->
    f#(s(x),s(y)) -> -#(max(s(x),s(y)),min(s(x),s(y)))
    f#(s(x),s(y)) -> f#(-(max(s(x),s(y)),min(s(x),s(y))),p(twice(min(x,y)))) ->
    f#(s(x),s(y)) -> max#(s(x),s(y))
    f#(s(x),s(y)) -> f#(-(max(s(x),s(y)),min(s(x),s(y))),p(twice(min(x,y)))) ->
    f#(s(x),s(y)) -> min#(s(x),s(y))
    f#(s(x),s(y)) -> f#(-(max(s(x),s(y)),min(s(x),s(y))),p(twice(min(x,y)))) ->
    f#(s(x),s(y)) -> p#(twice(min(x,y)))
    f#(s(x),s(y)) -> f#(-(max(s(x),s(y)),min(s(x),s(y))),p(twice(min(x,y)))) ->
    f#(s(x),s(y)) -> twice#(min(x,y))
    f#(s(x),s(y)) -> f#(-(max(s(x),s(y)),min(s(x),s(y))),p(twice(min(x,y)))) ->
    f#(s(x),s(y)) -> min#(x,y)
    f#(s(x),s(y)) -> -#(max(s(x),s(y)),min(s(x),s(y))) ->
    -#(s(x),s(y)) -> -#(x,y)
    f#(s(x),s(y)) -> twice#(min(x,y)) -> twice#(s(x)) -> twice#(x)
    f#(s(x),s(y)) -> max#(s(x),s(y)) ->
    max#(s(x),s(y)) -> max#(x,y)
    f#(s(x),s(y)) -> min#(s(x),s(y)) -> min#(s(x),s(y)) -> min#(x,y)
    f#(s(x),s(y)) -> min#(x,y) -> min#(s(x),s(y)) -> min#(x,y)
    -#(s(x),s(y)) -> -#(x,y) -> -#(s(x),s(y)) -> -#(x,y)
    twice#(s(x)) -> twice#(x) -> twice#(s(x)) -> twice#(x)
    max#(s(x),s(y)) -> max#(x,y) -> max#(s(x),s(y)) -> max#(x,y)
    min#(s(x),s(y)) -> min#(x,y) -> min#(s(x),s(y)) -> min#(x,y)
   SCC Processor:
    #sccs: 5
    #rules: 5
    #arcs: 16/121
    DPs:
     f#(s(x),s(y)) -> f#(-(max(s(x),s(y)),min(s(x),s(y))),p(twice(min(x,y))))
    TRS:
     min(0(),y) -> 0()
     min(x,0()) -> 0()
     min(s(x),s(y)) -> s(min(x,y))
     max(0(),y) -> y
     max(x,0()) -> x
     max(s(x),s(y)) -> s(max(x,y))
     twice(0()) -> 0()
     twice(s(x)) -> s(s(twice(x)))
     -(x,0()) -> x
     -(s(x),s(y)) -> -(x,y)
     p(s(x)) -> x
     f(s(x),s(y)) -> f(-(max(s(x),s(y)),min(s(x),s(y))),p(twice(min(x,y))))
    Open
    
    DPs:
     -#(s(x),s(y)) -> -#(x,y)
    TRS:
     min(0(),y) -> 0()
     min(x,0()) -> 0()
     min(s(x),s(y)) -> s(min(x,y))
     max(0(),y) -> y
     max(x,0()) -> x
     max(s(x),s(y)) -> s(max(x,y))
     twice(0()) -> 0()
     twice(s(x)) -> s(s(twice(x)))
     -(x,0()) -> x
     -(s(x),s(y)) -> -(x,y)
     p(s(x)) -> x
     f(s(x),s(y)) -> f(-(max(s(x),s(y)),min(s(x),s(y))),p(twice(min(x,y))))
    Subterm Criterion Processor:
     simple projection:
      pi(-#) = 1
     problem:
      DPs:
       
      TRS:
       min(0(),y) -> 0()
       min(x,0()) -> 0()
       min(s(x),s(y)) -> s(min(x,y))
       max(0(),y) -> y
       max(x,0()) -> x
       max(s(x),s(y)) -> s(max(x,y))
       twice(0()) -> 0()
       twice(s(x)) -> s(s(twice(x)))
       -(x,0()) -> x
       -(s(x),s(y)) -> -(x,y)
       p(s(x)) -> x
       f(s(x),s(y)) -> f(-(max(s(x),s(y)),min(s(x),s(y))),p(twice(min(x,y))))
     Qed
    
    DPs:
     max#(s(x),s(y)) -> max#(x,y)
    TRS:
     min(0(),y) -> 0()
     min(x,0()) -> 0()
     min(s(x),s(y)) -> s(min(x,y))
     max(0(),y) -> y
     max(x,0()) -> x
     max(s(x),s(y)) -> s(max(x,y))
     twice(0()) -> 0()
     twice(s(x)) -> s(s(twice(x)))
     -(x,0()) -> x
     -(s(x),s(y)) -> -(x,y)
     p(s(x)) -> x
     f(s(x),s(y)) -> f(-(max(s(x),s(y)),min(s(x),s(y))),p(twice(min(x,y))))
    Subterm Criterion Processor:
     simple projection:
      pi(max#) = 1
     problem:
      DPs:
       
      TRS:
       min(0(),y) -> 0()
       min(x,0()) -> 0()
       min(s(x),s(y)) -> s(min(x,y))
       max(0(),y) -> y
       max(x,0()) -> x
       max(s(x),s(y)) -> s(max(x,y))
       twice(0()) -> 0()
       twice(s(x)) -> s(s(twice(x)))
       -(x,0()) -> x
       -(s(x),s(y)) -> -(x,y)
       p(s(x)) -> x
       f(s(x),s(y)) -> f(-(max(s(x),s(y)),min(s(x),s(y))),p(twice(min(x,y))))
     Qed
    
    DPs:
     twice#(s(x)) -> twice#(x)
    TRS:
     min(0(),y) -> 0()
     min(x,0()) -> 0()
     min(s(x),s(y)) -> s(min(x,y))
     max(0(),y) -> y
     max(x,0()) -> x
     max(s(x),s(y)) -> s(max(x,y))
     twice(0()) -> 0()
     twice(s(x)) -> s(s(twice(x)))
     -(x,0()) -> x
     -(s(x),s(y)) -> -(x,y)
     p(s(x)) -> x
     f(s(x),s(y)) -> f(-(max(s(x),s(y)),min(s(x),s(y))),p(twice(min(x,y))))
    Subterm Criterion Processor:
     simple projection:
      pi(twice#) = 0
     problem:
      DPs:
       
      TRS:
       min(0(),y) -> 0()
       min(x,0()) -> 0()
       min(s(x),s(y)) -> s(min(x,y))
       max(0(),y) -> y
       max(x,0()) -> x
       max(s(x),s(y)) -> s(max(x,y))
       twice(0()) -> 0()
       twice(s(x)) -> s(s(twice(x)))
       -(x,0()) -> x
       -(s(x),s(y)) -> -(x,y)
       p(s(x)) -> x
       f(s(x),s(y)) -> f(-(max(s(x),s(y)),min(s(x),s(y))),p(twice(min(x,y))))
     Qed
    
    DPs:
     min#(s(x),s(y)) -> min#(x,y)
    TRS:
     min(0(),y) -> 0()
     min(x,0()) -> 0()
     min(s(x),s(y)) -> s(min(x,y))
     max(0(),y) -> y
     max(x,0()) -> x
     max(s(x),s(y)) -> s(max(x,y))
     twice(0()) -> 0()
     twice(s(x)) -> s(s(twice(x)))
     -(x,0()) -> x
     -(s(x),s(y)) -> -(x,y)
     p(s(x)) -> x
     f(s(x),s(y)) -> f(-(max(s(x),s(y)),min(s(x),s(y))),p(twice(min(x,y))))
    Subterm Criterion Processor:
     simple projection:
      pi(min#) = 1
     problem:
      DPs:
       
      TRS:
       min(0(),y) -> 0()
       min(x,0()) -> 0()
       min(s(x),s(y)) -> s(min(x,y))
       max(0(),y) -> y
       max(x,0()) -> x
       max(s(x),s(y)) -> s(max(x,y))
       twice(0()) -> 0()
       twice(s(x)) -> s(s(twice(x)))
       -(x,0()) -> x
       -(s(x),s(y)) -> -(x,y)
       p(s(x)) -> x
       f(s(x),s(y)) -> f(-(max(s(x),s(y)),min(s(x),s(y))),p(twice(min(x,y))))
     Qed