
theorem
  for a,b be Complex holds <*a*>/"<*b*> = <*(a*b")*>
  proof
    let a,b be Complex;
    reconsider p = <*(b")*> as 1-element FinSequence;
    reconsider q = <*b*>" as 1-element FinSequence;
    A1: len p = 1 & len q = 1 by CARD_1:def 7;
     (<*b*>").1 = (<*b*>.1)" by VALUED_1:10
    .= <*(b")*>.1; then
    A2: q = p by A1,FINSEQ_1:40;
    <*a*>(#)<*(b")*> = <*(a*(b"))*> by AMB;
    hence thesis by A2,VALUED_1:def 10;
  end;
