
theorem Th15:
  for S being non void Circuit-like non empty ManySortedSign for
  A being non-empty Circuit of S, s being State of A holds Following(s,2) =
  Following Following s
proof
  let S be non void Circuit-like non empty ManySortedSign;
  let A be non-empty Circuit of S, s be State of A;
  2 = 1+1;
  hence Following(s,2) = Following Following(s,0+1) by Th12
    .= Following Following s by Th14;
end;
