Grid Diagrams
Seminar/Forum
Grid diagrams are a classical approach to encoding links in the 3sphere combinatorially, and the grid diagrams associated to topologically equivalent links are related by sequences of simple moves. Restricting the allowed moves captures stronger notions of equivalence appearing in braid theory and 3dimensional contact geometry. I'll survey this beautiful theory, and if time permits, describe work that extends it to other 3manifolds.
Presenter

Joan Licata, Australian National University