document.write("« Collapsing K3 surfaces, Tropical geometry and Moduli compactifications of Satake, Morgan-Shalen type. (arXiv:1810.07685v1 [math.AG])");document.write(" | ");document.write("Constructing sparse Davenport-Schinzel sequences by hypergraph edge coloring. (arXiv:1810.07175v1 [math.CO]) »");