document.write("«&nbsp;<a href='/news/view?id=115792'>$7x+1$: Close Relative of Collatz Problem. (arXiv:1807.00908v1 [math.NT])</a>");document.write(" | ");document.write("<a href='/news/view?id=115794'>$G_{\delta}$ sets in $\sigma$-ideals generated by compact sets. (arXiv:1807.00845v1 [math.LO])</a>&nbsp;»");