
theorem Th21:
  for S being one-gate ManySortedSign for A being one-gate Circuit
  of S for s being State of A holds stabilization-time s <= 1
proof
  let S be one-gate ManySortedSign;
  let A be one-gate Circuit of S;
  let s be State of A;
  Following s is stable by Th19;
  then
A1: Following(s,1) is stable by FACIRC_1:14;
  s is stabilizing by Def2;
  hence thesis by A1,Def5;
end;
