reserve a,b,i,j,k,l,m,n for Nat;

theorem SFE:
  for a,b be Real holds
    ((a,b)Subnomial n), ((b,a) Subnomial n) are_fiberwise_equipotent
  proof
    let a,b be Real;
    ((a,b)Subnomial n), Rev((a,b)Subnomial n) are_fiberwise_equipotent by FFE;
    hence thesis by SAB;
  end;
