reserve x for set,
  D for non empty set,
  k, n for Nat,
  z for Nat;
reserve
  N for with_zero set,
  S for IC-Ins-separated non empty
          with_non-empty_values AMI-Struct over N,
  i for Element of the InstructionsF of S,
  l, l1, l2, l3 for Nat,
  s for State of S;
reserve ss for Element of product the_Values_of S;

theorem
  for i being Instruction of STC N holds i is jump-only
proof
  let i be Instruction of STC N;
  set M = STC N;
  let s be State of M, o be Object of M, I be Instruction of M such that
  InsCode I = InsCode i and
A1: o in Data-Locations M;
A2: IC M = 0 by Def7;
  Data-Locations M = ({0}) \ ({0}) by A2,Def7
       .= {} by XBOOLE_1:37;
   hence thesis by A1;
end;
