The  Weizmann  Institute  of  Science
                  Faculty of Mathematics and Computer Science
                        Seminar in Geometry and Topology
                    Seminar Room, Room 261, Ziskind Building
                         on Thursday, January 27, 2011
                                    at 16:00
                               Note unusual day 
                                Burglind Joricke
                                 will speak on
                Analytic knots, satellites and the 4-ball genus
Call a knot in the unit sphere in complex affine $2$-space analytic
(respectively, smoothly analytic) if it bounds a complex curve (respectively,
smooth complex curve) in the complex ball. Let $K$ be a smoothly analytic
knot.  We give a sharp lower bound for the $4$-ball genus of an arbitrary
analytic knot $L$ contained in a small tubular neighborhood of $K$ in terms of
the $4$-ball genus of $K$ and the winding number of $L$ with respect to $K$.
The question is related to branched coverings $p:Y \to X$ of (smoothly bounded)
open Riemann surfaces $X$,  embeddings of $Y$ into a disc bundle over $X$ and
and the braid formed by the related embedding of the boundary of $Y$.
Technion Math Net-2 (TECHMATH2)
Editor: Michael Cwikel   <> 
Announcement from: Diana Mandelik   <>