document.write("« Flexibly imposing periodicity in kernel independent FMM: A Multipole-To-Local operator approach. (arXiv:1705.02043v4 [math.NA] UPDATED)");document.write(" | ");document.write("Four-manifolds of Pinched Sectional Curvature. (arXiv:1809.05158v1 [math.DG]) »");