reserve f for Function;
reserve n,k,n1 for Element of NAT;
reserve r,p for Complex;
reserve x,y for set;
reserve seq,seq1,seq2,seq3,seq9,seq19 for Complex_Sequence;

theorem
  r(#)(seq1/"seq)=(r(#)seq1)/"seq
proof
  thus r(#)(seq1/"seq) = r(#)(seq1(#)(seq)") .= (r(#)seq1)/"seq by Th12;
end;
