a rational tangle?

Who?
Silvia de Toffoli (HU Berlin)
When?
2013/02/08, 13:00
Before the BMS Friday Colloquium by Prof. Dorothy Buck
Where?
Urania Berlin, at the BMS Loft (3rd floor)
A $n$-tangle is an embedding of a collection of $n$ arcs in a 3-ball such that the endpoints are on specific 2$n$ points on the boundary sphere. The focus will be on 2-tangles. A rational tangle is a 2-tangle that is homeomorphic to the trivial tangle, which is formed by two unlinked arcs, vertical or horizontal. By taking the numerator closure of a tangle we obtain a knot and, in particular, the numerator of a rational tangle is a rational knot.