"MATHEMATICS / Topology" . . "Tresses, Théorie des." . . "Braid theory." . . "Homotopietheorie." . . . . . . . . . . . . . . . . . . "Braid and knot theory in dimension four" . "Braid and knot theory in dimension four"@en . . . . . . . . . . "Electronic books"@en . . . "Knotentheorie." . . . . "Zopf (Mathematik)" . . "Knot theory." . . "Noeuds, Théorie des." . .