theorem
  seq_n^(1/2) in Big_Omega(seq_logn) & not seq_logn in Big_Omega(seq_n^( 1/2))
proof
  seq_logn in Big_Oh(seq_n^(1/2)) by Th4,Th5;
  hence thesis by Th4,Th5,ASYMPT_0:19;
end;
