- 追加された行はこの色です。
- 削除された行はこの色です。
* Hakata Workshop; Winter Meeting 2019 [#c276c899]
''〜Discrete Mathematics and its Applications〜''
#br
Our purpose of this meeting is giving an opportunity to make a speech and to communicate with researchers who study various fields not only Combinatorics.
Further information is available from the organizers below.
**Organizers [#k4943cc4]
-[[Yoshihiro Mizoguchi:http://imi.kyushu-u.ac.jp/~ym/]] (Kyushu University),~
-[[Tetsuji Taniguchi:http://researchmap.jp/tetsuzit-14/]] (Hiroshima Institute of Technology),~
-Osamu Shimabukuro (Nagasaki University),~
-Makoto Tagami (Kyushu Institute of Technology),~
-Hirotake Kurihara (Kitakyushu National College of Technology),~
-Shuya Chiba (Kumamoto University),~
-Tsuyoshi Miezaki (University of the Ryukyus).
**Supported by [#mecbfbc7]
-[[Graduate School of Mathematics, Kyushu University:http://www.math.kyushu-u.ac.jp/eng/]]
-JSPS KAKENHI(Grant-in-Aid for Scientific Research (C)) Grant Number 25400217.
-JSPS KAKENHI(Grant-in-Aid for Scientific Research (C)) Grant Number 17K05346
**Date [#n21a9c09]
February 21, 2019
**Location [#a0e5e74f]
Kyushu University
(see https://www.kyushu-u.ac.jp/en/campus/ito/ )
**Program [#nbb7f691]
-Thursday, February 21~
TBA
|16:00--17:30|[[ Poster Session (Software in Mathematics Demonstration Track in Hakata Workshop 2019):http://imi.kyushu-u.ac.jp/lasm/hakata2019/]]|
**Abstract [#u13ebdf3]
*** [#sa8ea1dc]
-Title:
*** Asuka TAKATSU [#sa8ea1dc]
-Title: Convergence of combinatorial Ricci flows to degenerate circle patterns
-Abstract:
On a connected, oriented, closed surface, a circle pattern metric determines a geometric structure (Riemannian metric of constant curvature) from a topological structure (weighted triangulation). A criterion for the existence of a circle pattern metric on a surface of nonpositive Euler characteristic was first proved by Thurston. Chow–Luo gave the algorithm, so-called the combinatorial Ricci flow, to find circle pattern metrics. Chow–Luo raised some questions about the combinatorial Ricci flow, one of which is to investigate the combinatorial Ricci flow when a circle pattern metric does not exist.
In my talk, I address this question.
*** [#dc2ebf78]
-Title:
*** Makoto Tagami[#dc2ebf78]
-Title: Harmonic Index t-design in Hamming Schemes
-Abstract:
The notion of harmonic index (or simply HI) spherical design was introduced as a finite set on a sphere in the form extending the notion of usual spherical designs by Bannai-Okuda-T (2015). They studied about a Fisher type inequality and construction for HI spherical design and argued about the non-existence of tight HI spherical designs. While Zhu-Bannai-Bannai-Ikuta-Kim(2017) reintroduced the notion of HI $t$-design in symmetric association schemes and they studied about HI $t$-designs in binary Hamming schemes. In this talk, we will study them in Hamming scheme H(n,q) for arbitrary q following BOT and ZBBIK .
*** [#h7fa4223]
-Title:
-Abstract:
*** [#rfaac07a]
-Title:
-Abstract:
*** [#va89d9ea]
-Title:
-Abstract:
