document.write("«&nbsp;<a href='/news/view?id=83590'>Factoriality and class groups of cluster algebras. (arXiv:1712.06512v1 [math.AC])</a>");document.write(" | ");document.write("<a href='/news/view?id=83592'>Fields generated by sums and products of singular moduli. (arXiv:1712.06502v1 [math.NT])</a>&nbsp;»");