Tuesday Seminar on Topology

Seminar information archive ~03/04Next seminarFuture seminars 03/05~

Date, time & place Tuesday 17:00 - 18:30 056Room #056 (Graduate School of Math. Sci. Bldg.)
Organizer(s) KAWAZUMI Nariya, KITAYAMA Takahiro, SAKASAI Takuya


16:30-18:00   Room #056 (Graduate School of Math. Sci. Bldg.)
Susumu Hirose (Tokyo University of Science)
On diffeomorphisms over non-orientable surfaces embedded in the 4-sphere (JAPANESE)
[ Abstract ]
For a closed orientable surface standardly embedded in the 4-sphere,
it was known that a diffeomorphism over this surface is extendable to
the 4-sphere if and only if this diffeomorphism preserves
the Rokhlin quadratic form of this surafce.
In this talk, we will explain an approach to the same kind of problem for
closed non-orientable surfaces.