Hiroshima Topology Conference 2011 November

Hiroshima Topology Conference

Four Dimensional Topology

Hiroshima University, Hiroshima Japan

November 7 -- November 9, 2011

Speakers include
Jonathan A. Hillman (University of Sydney)
Akio Kawauchi (Osaka City University)
Nobuhiro Nakamura (The University of Tokyo)

Program (pdf in Japanese) (pdf in English)

November 7 (Mon)

14:00--14:40 Takefumi Nosaka (RIMS, Kyoto University)
Quandle cocycle invariants of Lefschetz fibrations over the 2-sphere

14:50--15:30 Naoyuki Monden (Osaka University)
On stable commutator length in hyperelliptic mapping class groups

15:50--16:30 Yasuyoshi Tsutsumi (Oshima National College of Maitime Technology)
Negativity of the Lescop invariants of the Brieskorn-Hamm manifolds

16:40--17:10 Tsuyoshi Uno (Tokyo Gakugei University)
Sheet number and 11-colorable 2-knot

17:20--17:50 Yuma Taniguchi (Tokyo Gakugei University)
Interpretations of rack coloring link invariants in terms of quandles

November 8 (Tue)

09:10--09:50 Kouichi Yasui (Hiroshima University)
Exotic 4-manifolds with boundary, minimal genera and Stein fillable 3-manifolds

10:00--10:40 Noriyuki Hamada (Kyushu University)
Upper bounds for the minimal number of singular fibers in a Lefschetz fibration over the torus

11:00--11:40 Sosuke Ashihara (Hiroshima University)
The fundamental biquandles of twist spun trefoils

11:50--12:30 Teruo Nagase and Akiko Shima (Tokai Unverisity)
4-charts with four crossings

14:00--14:50 Akio Kawauchi (Osaka City University)
2-knots in the stable 4-space

15:00--15:50 Jonathan A. Hillman (University of Sydney)
$S^2$-bundles over 2-orbifolds

16:10--17:00 Nobuhiro Nakamura (The University of Tokyo)
The genus of nonorientable embedded surfaces in 4-manifolds

17:10--17:50 Kanako Oshiro (Japan Women's University)
Minimal numbers of colors for surface-knots and quandle cocycle invariants (joint work with Shin Satoh)

November 9 (Wed)

09:10--09:50 Yoshiro Yaguchi (Hiroshima University)
Hurwitz equivalence on simple braid systems

10:00--10:40 Tetsuya Abe (RIMS, Kyoto University)
On the shake genus and sliceness of a knot

11:00--11:40 Masatoshi Sato (Osaka University)
Four-manifolds admitting hyperelliptic simplified broken Lefschetz fibrations

13:00--13:40 Motoo Tange (RIMS, Kyoto University)
A plug for knot surgery

13:50--14:30 Takao Matumoto (Hiroshima University)
On the smooth unknotting conjecture in dimension four VII

Organizers: Seiichi Kamada,Takao Matumoto and Kouichi Yasui (Hiroshima University)