document.write("« A Hierarchical Butterfly LU Preconditioner for Two-Dimensional Electromagnetic Scattering Problems Involving Open Surfaces. (arXiv:1901.11371v1 [math.NA])");document.write(" | ");document.write("A New Proof of Nonsignalling Multiprover Parallel Repetition Theorem. (arXiv:1901.11105v1 [cs.IT]) »");