theorem
  for x being Element of SCMPDS-Instr, mk being Element of SCM-Data-Loc
  st x = [I,{},<*mk*>] holds x address_1 = mk
proof
  let x be Element of SCMPDS-Instr, mk be Element of SCM-Data-Loc;
  assume
A1: x = [I,{},<*mk*>];
  then consider f being FinSequence of SCM-Data-Loc such that
A2: f = x`3_3 and
A3: x address_1 = f/.1 by Def2;
  f = <*mk*> by A1,A2;
  hence thesis by A3,FINSEQ_4:16;
end;
