document.write("«&nbsp;<a href='/news/view?id=83656'>Land Registry data reveals London’s secret tunnels</a>");document.write(" | ");document.write("<a href='/news/view?id=83658'>Leavitt path algebras of Cayley graphs $C_n^j$. (arXiv:1712.06480v1 [math.RA])</a>&nbsp;»");