reserve i,j,k,m,n for Nat,
  D for non empty set,
  p for Element of D,
  f for FinSequence of D;
reserve D for non empty set,
  p for Element of D,
  f for FinSequence of D;
reserve f for circular FinSequence of D;
reserve f,g for FinSequence of TOP-REAL 2;
reserve p for Point of TOP-REAL 2,
  f for FinSequence of TOP-REAL 2;

theorem Th28:
  for f being non empty circular FinSequence of TOP-REAL 2 holds
  GoB Rotate(f,p) = GoB f
proof
  let f be non empty circular FinSequence of TOP-REAL 2;
  Incr X_axis f = Incr X_axis Rotate(f,p) & Incr Y_axis f = Incr Y_axis
  Rotate (f,p) by Th26,Th27;
  hence GoB Rotate(f,p) = GoB(Incr X_axis f,Incr Y_axis f) by GOBOARD2:def 2
    .= GoB f by GOBOARD2:def 2;
end;
