theorem
  (for n holds rseq1.n = n-root (|.seq.|.n)) & (ex m st for n st m<=n
  holds rseq1.n>= 1) implies |.seq.| is not summable
proof
  assume
A1: ( for n holds rseq1.n = n-root (|.seq.|.n))& ex m st for n st m<=n
  holds rseq1 .n>= 1;
  for n holds |.seq.|.n >=0 by Lm3;
  hence thesis by A1,SERIES_1:29;
end;
