
theorem BlaBla:
  for f be heterogeneous non empty real-valued FinSequence,
      i,j being Nat st
     i = the Element of MeanLess f &
     j = the Element of MeanMore f holds
   i in dom f & j in dom f & i <> j & f.i < Mean f & f.j > Mean f
  proof
    let f be heterogeneous non empty real-valued FinSequence;
    let i,j be Nat;
    assume
A1: i = the Element of MeanLess f &
    j = the Element of MeanMore f;
    i in MeanLess f by A1; then
    consider ii being Nat such that
A2: ii = i & ii in dom f & f.ii < Mean f;
    j in MeanMore f by A1; then
    consider jj being Nat such that
A3: jj = j & jj in dom f & f.jj > Mean f;
    thus thesis by A2,A3;
  end;
