document.write("«&nbsp;<a href='/news/view?id=139440'>A counterexample for the conjecture of finite simple groups. (arXiv:1810.03786v1 [math.GR])</a>");document.write(" | ");document.write("<a href='/news/view?id=139442'>A necessary and sufficient condition for the stability of linear Hamiltonian systems with periodic coefficients. (arXiv:1810.03971v1 [math-ph])</a>&nbsp;»");