theorem
  not a in dom Start-At(l,SCMPDS)
proof
A1: dom Start-At(l,SCMPDS) = {IC SCMPDS} by FUNCOP_1:13;
  assume
  a in dom Start-At(l,SCMPDS);
  then a = IC SCMPDS by A1,TARSKI:def 1;
  hence contradiction by SCMPDS_2:43;
end;
