theorem
  lim Basel-seq1 = PI^2/6 = lim Basel-seq2
  proof
    lim(p(#)rseq(2,0,2,1)) = p*lim(rseq(2,0,2,1)) by SEQ_2:8;
    hence lim Basel-seq1 = PI^2/6 by Lm17,Lm18,SEQ_2:15;
    lim(p(#)rseq(2,0,2,1)) = p*lim(rseq(2,0,2,1)) by SEQ_2:8;
    hence thesis by Lm17,Lm19,SEQ_2:15;

  end;
