MAYBE

Problem:
 minus(minus(x)) -> x
 minus(+(x,y)) -> *(minus(minus(minus(x))),minus(minus(minus(y))))
 minus(*(x,y)) -> +(minus(minus(minus(x))),minus(minus(minus(y))))
 f(minus(x)) -> minus(minus(minus(f(x))))

Proof:
 RT Transformation Processor:
  strict:
   minus(minus(x)) -> x
   minus(+(x,y)) -> *(minus(minus(minus(x))),minus(minus(minus(y))))
   minus(*(x,y)) -> +(minus(minus(minus(x))),minus(minus(minus(y))))
   f(minus(x)) -> minus(minus(minus(f(x))))
  weak:
   
  Matrix Interpretation Processor:
   dimension: 1
   interpretation:
    [f](x0) = x0 + 3,
    
    [*](x0, x1) = x0 + x1 + 2,
    
    [+](x0, x1) = x0 + x1,
    
    [minus](x0) = x0
   orientation:
    minus(minus(x)) = x >= x = x
    
    minus(+(x,y)) = x + y >= x + y + 2 = *(minus(minus(minus(x))),minus(minus(minus(y))))
    
    minus(*(x,y)) = x + y + 2 >= x + y = +(minus(minus(minus(x))),minus(minus(minus(y))))
    
    f(minus(x)) = x + 3 >= x + 3 = minus(minus(minus(f(x))))
   problem:
    strict:
     minus(minus(x)) -> x
     minus(+(x,y)) -> *(minus(minus(minus(x))),minus(minus(minus(y))))
     f(minus(x)) -> minus(minus(minus(f(x))))
    weak:
     minus(*(x,y)) -> +(minus(minus(minus(x))),minus(minus(minus(y))))
   Matrix Interpretation Processor:
    dimension: 1
    interpretation:
     [f](x0) = x0 + 16,
     
     [*](x0, x1) = x0 + x1 + 30,
     
     [+](x0, x1) = x0 + x1 + 20,
     
     [minus](x0) = x0 + 2
    orientation:
     minus(minus(x)) = x + 4 >= x = x
     
     minus(+(x,y)) = x + y + 22 >= x + y + 42 = *(minus(minus(minus(x))),minus(minus(minus(y))))
     
     f(minus(x)) = x + 18 >= x + 22 = minus(minus(minus(f(x))))
     
     minus(*(x,y)) = x + y + 32 >= x + y + 32 = +(minus(minus(minus(x))),minus(minus(minus(y))))
    problem:
     strict:
      minus(+(x,y)) -> *(minus(minus(minus(x))),minus(minus(minus(y))))
      f(minus(x)) -> minus(minus(minus(f(x))))
     weak:
      minus(minus(x)) -> x
      minus(*(x,y)) -> +(minus(minus(minus(x))),minus(minus(minus(y))))
    Open