document.write("«&nbsp;<a href='/news/view?id=80513'>Descending chains of semistar operations. (arXiv:1711.05399v1 [math.AC])</a>");document.write(" | ");document.write("<a href='/news/view?id=80515'>Different definitions of conic sections in hyperbolic geometry. (arXiv:1603.09285v2 [math.MG] UPDATED)</a>&nbsp;»");