Japanese

Seminars related to

"Low-Dimensional Topology in the Twenty-First Century"

(last update: July 24, 2001)

 Title: Quantum invariants of periodic 3-manifolds Speaker: Nafaa Chbili (Monastir Fac. of Sciences, Tunisia) Date: August 3 (Fri), 14:00-15:00 Place : Room 202, RIMS Abstract: Let $p\geq 2$ an integer, a 3-manifold $M$ is said to be $p$-periodic if the finite cyclic group of order $p$ acts semi-freely on $M$ with a circle as the set of fixed points. We use the SU(2) quantum invariants to provide a condition for a 3-manifold to be periodic.

 Title: 3-manifold quantum invariants for general simple Lie algebra Speaker: Thang Le (SUNY Buffalo) Date: July 27 (Fri), 14:00-15:00 Place : Room 202, RIMS Abstract: The talk is a survey of 3-manifold quantum invariants. We will describe basic definitions and fundamental properties of quantum invariants.

The main thema of the first half of the project is "geometric methods in low dimensional topology". We are planning to have regular seminars on

every Friday afternoon and Saturday

during the period. Particularly in May, and June we save a room in RIMS, and it is possible to have irregular seminars there.

Note that the building of RIMS is closed on Saturday. If you are interseted in attending the seminar on Saturday, please contact Kobayashi:

tsuyoshi@cc.nara-wu.ac.jp

We have an inexpensive accommodation (4 rooms) near RIMS. Three of them are located on the first floor, and are (mainly) for males, and the rest one room is on the second floor and (maily) for females. We are glad if (particularly) young mathematician stay there and can have good communications with mathematicians from foreign countries.

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No seminar will be held July 7(Saturday), July 13(Friday), July 14(Saturday), July 20(Friday), July 21(Saturday)

Date: July 6(Friday), 2:00 p.m. --

Place: RIMS room(202)

Speaker: Prof. Tatsuhiko Yagasaki (Kyoto Institute of Technology)

Title: Homotopy types of homeomorphism groups and diffeomorphism groups

Date: June 30(Saturday), 10:00 a.m. --

Place: RIMS room(202)

Speaker: Dr. Zin Arai (Kyoto Univ.)

Title: Morse-Smale diffeomorphisms on 3-manifolds

Date: June 29(Friday), 2:00 p.m. --

Place: RIMS room(202)

Speaker: Dr. Atsuhide Mori (Kyoto Sangyo University)

Title: Open-book decompositions & contact structures

Date: June 23(Saturday), 10:00 a.m. --

Place: RIMS room(202)

Speaker: Prof. E. Sedgwick (DePaul University)

Title: Decision problems in the space of Dehn fillings

Date: June 22(Friday), 2:00 p.m. --

Place: RIMS room(202)

Speaker: Prof. Thomas Mattman (California State University, Chico)

Title: Cyclic surgeries and boundary slopoes

Date: June 16(Saturday), 10:00 a.m. --

Place: RIMS room(202)

Speaker: Prof. Masako Kobayashi (Assumption Junior College)

Title: Masako Kobayashi will give a seminar on Lackenby's papar:

Classification of Alternating Knots with tunnel number one

Date: June 9(Saturday), 10:00 a.m. --

Place: RIMS room(202)

Speaker: Prof. Jennifer Schultens (Emory University)

Title: Lectures on 3-manifolds (4)

Date: June 8(Friday), 2:00 p.m. --

Place: RIMS room(202)

Speaker: Prof. Yuichi Yamada (The University of Electro-Communications )

Title: Projective planes in 4-mainfolds and surgery along them

Abstract: For "unknotted" projective plane Po in the 4-sphere S^4, it is known that the exterior E(Po)is diffeomorphic to the neighborhood N(Po), which can be regarded as a Heegaard splitting of S^4.
Some of the speaker's results started at this fact. In the talk, he talks on a sum formula on surgery along a projective plane and a 2-sphere in 4-manifolds.

Date: June 4(Monday) (NOTE!), 10:00 a.m. --, 1:00 p.m. --

Place: RIMS room (202)

Speaker: Prof. Martin Scharlemann (U. California, Santa Barbara)

Title: Lectures on 3-manifolds (3)

Date: June 2(Saturday)

Seminar will not be held on June 2.

Date: June 1(Friday), 2:00 p.m. --

Place: RIMS room(202)

Speaker: Prof. Martin Scharlemann (U. California, Santa Barbara)

Title: Lectures on 3-manifolds (2)

Date: May 26(Saturday), 10:00 a.m. --11:30 a.m.

Place: RIMS room(202)

Speaker: Prof. Martin Scharlemann (U. California, Santa Barbara)

Title: Lectures on 3-manifolds (1)

Prof. Scharlemann, and Prof. Schultens will give a series of lectures on 3-manifolds. Theis is the first lecture.

Date: May 25(Friday), 2:00 p.m. --

Place: RIMS room(202)

Speaker: Prof. Tobias Ekholm (University of Uppsala)

Title: Legendrian n-knots in Euclidean space

Abstract: The standrard contact structure on $\R^{2n+1}$ is the hyperplane field $\xi=\{dz-\sum y_idx_i=0\}$. A Legendrian $n$-knot is an embedding of of $S^n$ into $R^{2n+1}$ which is everywhere tangent to $\xi$. In 1997 Chekanov and Eliashberg showed that there exist topologically isotopic $1$-knots with the same classical invariants (Maslov-index and Thurston-Bennequin invariant) which are not Legendrian isotopic. This was acheived using contact homology. In this talk we shall describe contact homology for Legendrian $n$-knots. Using it we establish the existence of new infinite families of non-trivial Legendrian $n$-knots. In particular, this proves the existence of knotted Legendrian $n$-knots in Euclidean space for $n$-even.

Date: May 19(Saturday), 10:00 a.m. --12:00 a.m.

Place: RIMS room(202)

Speaker: Prof. Jennifer Schultens (Emory University)

Title: Prof. Schultens will give a talk on the paper

"M.Scharlemann, J.Schultens, Annuli in generalized Heegaard splittongs and degeneration of tuunel number, Math. Ann. 317(2000), 783--820"

May be the seminar will be held in the afternoon too.

Date: May 18(Friday), 2:00 p.m. --

Place: RIMS room(202)

Speaker: Prof. Han Yoshida (Nara Women's University)

Title: Volume of 2-cusped orientable hyperbolic 3-manifolds

Date: May 12(Saturday), 10:00 a.m. --12:00 a.m.

Place: RIMS room(202)

Speaker:Dr. Eiko Kin (Kyoto Univ.)

Title: Introduction to twist maps

Date: May 12(Saturday), 1:30 p.m. --

Place: RIMS room(202)

Speaker: Dr. H. Akiyoshi(RIMS)

Title: Canonical decompositions of hyperbolic 3-manifolds obtained by Dehn surgeries on two cusped hyperbolic 3-manifolds

Date: May 11(Friday), 2:00 p.m. --

Place: RIMS room(202)

Speaker: Prof. Cristian Kassel (Universit\'e Louis Pasteur)

Title: Linear ordering on braid groups

Abstract: In the beginning of the 1990's, P. Dehornoy, investigating selfdistributive systems, constructed a linear ordering on Artin's braid groups. Selfdistributive systems are sets equipped with a binary law satisfying the identity x(yz) = (xy)(xz). Such systems came up in the study of a large cardinal axiom in set theory.
In this talk (which is an English version of the talk I gave in November 1999 at the Bourbaki Seminar in Paris) I present Dehornoy's work and its unexpected link with set theory.
I also survey a recent geometric construction of Dehornoy's ordering.

Reference: http://www-irma.u-strasbg.fr/irma/publications/1999/99050.ps.gz
(French)

Date: April 28(Saturday), 10:00 a.m. --

Place: RIMS room(202)

Speaker: Dr. Kazuo Habiro@(RIMS)

Title: Finite type invariants and clasper surgeries(2)

Date: April 28(Saturday), 1:00 p.m. --

Place: RIMS room(202)

Speaker: Prof. Masakazu Teragaito (Hiroshima Univ.)

Title: Doubly primitive knots by J.Berge

Date: April 27(Friday), 2:00 p.m. --

Place: RIMS room(202)

Speaker: Dr. Kazuo Habiro@(RIMS)

Title: Finite type invariants and clasper surgeries(1)

Date: April 21(Saturday), 10:00 a.m. --

Place: RIMS room(202)

Speaker: Prof. Martin Scharlemann (U. California, Santa Barbara)

He talked, as a sequal of the last talk, about the paper:

"Producing reducible 3-manifolds by surgery on a knot, Topology 29(1990), 481--500"

Date: April 21(Saturday), 1:30 p.m. --

Place: RIMS room(202)

Speaker:Dr. Mikami Hirasawa (Gakushuin Univ.)

Title:

He gava a talk on some strange behaviers of knots and links under Murasugi sum along compressible Seifert surfaces.

Date: April 20 (Friday), 2:00p.m.--
Place: Room 202, RIMS

Speaker: Prof. Martin Scharlemann (U. California, Santa Barbara)

He will give a talk on his paper

"Producing reducible 3-manifolds by surgery on a knot, Topology 29(1990), 481--500"

Possibly the seminar will be held on April 21 too.