theorem
  T = 4 implies JumpParts T = {{}}
proof
  assume
A1: T = 4;
  hereby
    let x be object;
    assume x in JumpParts T;
     then consider I being Instruction of SCM R such that
A2:   x = JumpPart I and
A3:   InsCode I = T;
     consider a,b such that
A4:   I = MultBy(a,b) by A1,A3,Th15;
     x = {} by A2,A4;
    hence x in {{}} by TARSKI:def 1;
  end;
  set a = the Data-Location of R;
  let x be object;
  assume x in {{}};
   then x = {} by TARSKI:def 1;
   then
A5:  x = JumpPart MultBy(a,a);
    InsCode MultBy(a,a) = 4;
  hence thesis by A5,A1;
end;
