Hakata Workshop;Winter Meeting 2019 の履歴(No.3)

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Hakata Workshop;Winter Meeting 2019 へ行く。
- 1 (2019-01-05 (土) 03:08:01)
- 2 (2019-01-05 (土) 03:14:45)
- 3 (2019-01-12 (土) 03:47:35)
- 4 (2019-01-13 (日) 23:22:55)
- 5 (2019-01-23 (水) 05:40:58)
- 6 (2019-01-31 (木) 06:57:28)
- 7 (2019-02-18 (月) 07:52:48)
- 8 (2019-02-18 (月) 11:41:33)

Hakata Workshop; Winter Meeting 2019†

〜Discrete Mathematics and its Applications〜

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.

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Organizers†

Yoshihiro Mizoguchi (Kyushu University),
Tetsuji Taniguchi (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).

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Supported by†

Graduate School of Mathematics, Kyushu University
JSPS KAKENHI(Grant-in-Aid for Scientific Research (C)) Grant Number 25400217.
JSPS KAKENHI(Grant-in-Aid for Scientific Research (C)) Grant Number 17K05346

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Date†

February 21, 2019

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Asuka TAKATSU†

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.

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Makoto Tagami†

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 .

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