TANIGUCHI Tetsuji 谷口哲至

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Taniguchi Tetsuji 谷口哲至

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Researcher Number	90543728
Other IDs
Affiliation (Current)	2025: 広島工業大学, 工学部, 准教授
Affiliation (based on the past Project Information) *help	2014 – 2023: 広島工業大学, 工学部, 准教授 2013: 松江工業高等専門学校, 数理科学科, 講師 2008: 松江工業高等専門学校, 数理科学科, 助教
Review Section/Research Field	Principal Investigator Foundations of mathematics/Applied mathematics / Basic Section 12030:Basic mathematics-related Except Principal Investigator Basic Section 12010:Basic analysis-related / Basic Section 12030:Basic mathematics-related / General mathematics (including Probability theory/Statistical mathematics)
Keywords	Principal Investigator 代数的グラフ理論 / スペクトラルグラフ理論 / 代数的組合せ論 / 整格子 / 固有値 / グラフ / 符号理論 / デザイン理論 / 離散数学 / 量子ウォーク … More / 格子 / 代数的整数 / 多項式 / 代数構造 … More Except Principal Investigator グラフ理論 / ユニタリ表現 / グラフ自己同型群 / 再生核ヒルベルト空間 / グラフ / 正定値カーネル / 機械学習 / 関数解析 / SIC-POVM / MUB / 不変なアダマール行列 / 等角直線族 / 直交配列 / disjoint weighing matrix / directed Deza graph / 不定値ユニタリ群 / Hermite adjacency matrix / BGW / Equiangular tight frame / Orthogonla design / Divisible design digraph / Q-多項式コヒアラント配置 / 強正則グラフ / 直交数独 / 数独 / balanced weighing matrix / weighing matrix / optilmal code / アソシエーションスキーム / 有限射影平面 / アダマール行列 / 半正定値計画法 / 不定値内積空間 / エルミート隣接行列 / デザイン / 符号 / 可換アソシエーション・スキーム / ブルガリア : オランダ / 国際情報交換 / 組合せデザイン / 格子 / 有限体 / 自己双対符号 / 代数的符号理論 / 置換群論 / 組合せデザイン理論 / 離散幾何 / 符号理論 / 代数的組合せ論 / 応用数学 Less

Characterization and classification of integrable algebraic structures by algebraic graph theory.Principal Investigator
- Principal Investigator
  
  Taniguchi Tetsuji
- Project Period (FY)
  2021 – 2023
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Review Section
  
  Basic Section 12030:Basic mathematics-related
- Research Institution
  Hiroshima Institute of Technology
Functional analysis approach to time evolution of graphs and its application
- Principal Investigator
  
  Seto Michio
- Project Period (FY)
  2020 – 2023
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Review Section
  
  Basic Section 12010:Basic analysis-related
- Research Institution
  防衛大学校(総合教育学群、人文社会科学群、応用科学群、電気情報学群及びシステム工学群)
Study on complex spherical codes and designs
- Principal Investigator
  
  Suda Sho
- Project Period (FY)
  2018 – 2022
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Review Section
  
  Basic Section 12030:Basic mathematics-related
- Research Institution
  防衛大学校(総合教育学群、人文社会科学群、応用科学群、電気情報学群及びシステム工学群)
  Aichi University of Education
On Characterisations and Classifications of graphs by their EigenvaluesPrincipal Investigator
- Principal Investigator
  
  Taniguchi Tetsuji
- Project Period (FY)
  2016 – 2019
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  Foundations of mathematics/Applied mathematics
- Research Institution
  Hiroshima Institute of Technology
A elucidation of the structure of graphs by Algebraic Graph Theory and Spectral Graph TheoryPrincipal Investigator
- Principal Investigator
  
  Taniguchi Tetsuji
- Project Period (FY)
  2013 – 2015
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  Foundations of mathematics/Applied mathematics
- Research Institution
  Hiroshima Institute of Technology
  Matsue National College of Technology
Applications of algebraic methods in coding theory to combinatorial designs and discrete geometry
- Principal Investigator
  
  MUNEMASA Akihiro
- Project Period (FY)
  2005 – 2008
- Research Category
  
  Grant-in-Aid for Scientific Research (B)
- Research Field
  
  General mathematics (including Probability theory/Statistical mathematics)
- Research Institution
  Tohoku University

All 2023 2022 2021 2019 2018 2017 2016 2015 2014 2013 2008 2007 Other

All Journal Article Presentation

[Journal Article] On graphs with the smallest eigenvalue at least -1-√2, part III2019
- Author(s)
  Kubota Sho、Taniguchi Tetsuji、Yoshino Kiyoto
- Journal Title
  
  Ars Mathematica Contemporanea
  
  Volume: 17 Issue: 2 Pages: 555-579
- DOI
  10.26493/1855-3974.1581.b47
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-16K05263
[Journal Article] A quantum walk induced by Hoffman graphs and its periodicity2019
- Author(s)
  Kubota Sho、Segawa Etsuo、Taniguchi Tetsuji、Yoshie Yusuke
- Journal Title
  
  Linear Algebra and its Applications
  
  Volume: 579 Pages: 217-236
- DOI
  10.1016/j.laa.2019.05.026
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19K03616, KAKENHI-PROJECT-18J10656, KAKENHI-PROJECT-16K05263
[Journal Article] Periodicity of Grover walks on generalized Bethe trees2018
- Author(s)
  Sho Kubota, Etsuo Segawa, Tetsuji Taniguchi, Yusuke Yoshie
- Journal Title
  
  Linear Algebra and its Applications
  
  Volume: 554 Pages: 371-391
- DOI
  10.1016/j.laa.2018.05.023
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-16K05263, KAKENHI-PROJECT-18J10656, KAKENHI-PROJECT-16K17637
[Journal Article] GRAM MATRICES OF REPRODUCING KERNEL HILBERT SPACES OVER GRAPHS II (GRAPH HOMOMORPHISMS AND DE BRANGES-ROVNYAK SPACES)2015
- Author(s)
  Michio Seto; Sho Suda; Tetsuji Taniguchi
- Journal Title
  
  Nihonkai Mathematical Journal
  
  Volume: 26 Pages: 15-29
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-25400217
[Journal Article] Edge-signed graphs with smallest eigenvalue greater than -22015
- Author(s)
  Greaves, Gary; Koolen, Jack; Munemasa, Akihiro; Sano, Yoshio; Taniguchi, Tetsuji
- Journal Title
  
  Journal of Combinatorial Theory. Series B
  
  Volume: 110 Pages: 90-110
- DOI
  10.1016/j.jctb.2014.07.006
- Peer Reviewed / Acknowledgement Compliant
- Data Source
  KAKENHI-PROJECT-25400217, KAKENHI-PROJECT-15K20885
[Journal Article] On the smallest eigenvalues of the line graphs of some trees.2015
- Author(s)
  Munemasa, Akihiro; Sano, Yoshio; Taniguchi, Tetsuji
- Journal Title
  
  Linear Algebra and its Applications
  
  Volume: 466 Pages: 501-511
- DOI
  10.1016/j.laa.2014.10.037
- Peer Reviewed / Acknowledgement Compliant
- Data Source
  KAKENHI-PROJECT-25400217, KAKENHI-PROJECT-15K20885
[Journal Article] Gram matrices of reproducing kernel Hilbert spaces over graphs2014
- Author(s)
  Michio Seto, Sho Suda, Tetsuji Taniguchi
- Journal Title
  
  Linear algebra and its applications
  
  Volume: 445 Pages: 56-68
- DOI
  10.1016/j.laa.2013.12.001
- NAID
  120005497076
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-25400217
[Journal Article] Fat Hoffman graphs with smallest eigenvalue greater than -32014
- Author(s)
  Akihiro Munemasa, Yoshio Sano, Tetsuji Taniguchi
- Journal Title
  
  Discrete Applied Mathematics
  
  Volume: Available online 29 January Pages: 78-88
- DOI
  10.1016/j.dam.2014.01.008
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-25400217, KAKENHI-PROJECT-25887007
[Journal Article] ホフマングラフとグラフの階層構造2013
- Author(s)
  谷口哲至
- Journal Title
  
  組合せサマースクール2013 予稿集
  
  Volume: 1 Pages: 20-21
- Data Source
  KAKENHI-PROJECT-25400217
[Journal Article] Hoffman graphs and edge-signed graphs2013
- Author(s)
  谷口哲至
- Journal Title
  
  第30回代数的組合せ論シンポジウム報告集
  
  Volume: 1 Pages: 136-141
- Data Source
  KAKENHI-PROJECT-25400217
[Journal Article] ホフマングラフとグラフの階層構造2013
- Author(s)
  谷口哲至
- Journal Title
  
  離散数学とその応用研究集会２０１３予稿集
  
  Volume: 1 Pages: 75-76
- Data Source
  KAKENHI-PROJECT-25400217
[Journal Article] On graphs with the smallest eigenvalue at least-1-square root 22008
- Author(s)
  T. Taniguchi
- Journal Title
  
  Ars Math. Contemp 1
  
  Pages: 81-98
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17340020
[Presentation] 辺符号グラフのライングラフとその最小固有値による表現2023
- Author(s)
  谷口哲至
- Organizer
  近畿大学（談話会）
- Invited
- Data Source
  KAKENHI-PROJECT-21K03344
[Presentation] Hoffman graphs and Integral lattices2023
- Author(s)
  Tetsuji Taniguchi
- Organizer
  the 10th Slovenian Conference on Graph
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-21K03344
[Presentation] Hoffman Graph2023
- Author(s)
  Tetsuji Taniguchi
- Organizer
  Catch-all Mathematical Colloquium of Japan
- Invited
- Data Source
  KAKENHI-PROJECT-21K03344
[Presentation] 辺符号グラフのライングラフとその最小固有値による表現2023
- Author(s)
  谷口哲至
- Organizer
  早稲田大学（談話会）
- Invited
- Data Source
  KAKENHI-PROJECT-21K03344
[Presentation] グラフの固有値とライングラフの一般化2022
- Author(s)
  谷口哲至
- Organizer
  日本数学会
- Invited
- Data Source
  KAKENHI-PROJECT-21K03344
[Presentation] グラフの固有値とライングラフの一般化 ~ グラフに意味のある分解を与えてみよう ~2022
- Author(s)
  谷口哲至
- Organizer
  日本数学会 2022 年度年会
- Invited
- Data Source
  KAKENHI-PROJECT-21K03344
[Presentation] 整化可能な整格子2021
- Author(s)
  谷口哲至
- Organizer
  代数的組合せ論シンポジウム
- Data Source
  KAKENHI-PROJECT-21K03344
[Presentation] weighted Hoffman Graph2019
- Author(s)
  Tetsuji Taniguchi
- Organizer
  9th Slovenian International Conference on Graph Theory - Bled'19
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-16K05263
[Presentation] A Generalization of Hoffman Graph2019
- Author(s)
  谷口哲至
- Organizer
  2020組合せ論とその周辺研究集会
- Data Source
  KAKENHI-PROJECT-16K05263
[Presentation] スペクトラルグラフ理論研究における数学ソフトウェアの活用2019
- Author(s)
  谷口哲至
- Organizer
  数学ソフトウェアとフリードキュメントXXVIII
- Invited
- Data Source
  KAKENHI-PROJECT-16K05263
[Presentation] スペクトラルグラフ理論研究における数学ソフトウェアの活用2019
- Author(s)
  谷口哲至
- Organizer
  松江セミナー
- Invited
- Data Source
  KAKENHI-PROJECT-16K05263
[Presentation] A Generalization of Hoffman Graph2019
- Author(s)
  Tetsuji Taniguchi
- Organizer
  Sendai Workshop on Combinatorics
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-16K05263
[Presentation] generalized Hoffman Graph2019
- Author(s)
  谷口哲至
- Organizer
  博多ワークショップ
- Data Source
  KAKENHI-PROJECT-16K05263
[Presentation] グラフの固有値2018
- Author(s)
  谷口哲至
- Organizer
  松江セミナー
- Invited
- Data Source
  KAKENHI-PROJECT-16K05263
[Presentation] ホフマングラフのその後2018
- Author(s)
  谷口哲至
- Organizer
  COS2018
- Data Source
  KAKENHI-PROJECT-16K05263
[Presentation] 一般べーテ木におけるグローバーウォークの周期性2017
- Author(s)
  谷口哲至
- Organizer
  第３４回代数的組合せ論シンポジウム
- Data Source
  KAKENHI-PROJECT-16K05263
[Presentation] グラフの固有値に対する禁止グラフ2017
- Author(s)
  谷口哲至
- Organizer
  軽井沢グラフと解析研究集会
- Data Source
  KAKENHI-PROJECT-16K05263
[Presentation] ホフマングラフ2017
- Author(s)
  谷口哲至
- Organizer
  代数的組合せ論「仙台勉強会」
- Place of Presentation
  東北大学（宮城県仙台市）
- Invited
- Data Source
  KAKENHI-PROJECT-16K05263
[Presentation] グラフの固有値に対する禁止グラフ2017
- Author(s)
  谷口哲至
- Organizer
  応用数学合同研究集会
- Data Source
  KAKENHI-PROJECT-16K05263
[Presentation] A Representation of Hoffman Graphs2017
- Author(s)
  谷口哲至
- Organizer
  代数・解析・幾何学セミナー
- Place of Presentation
  鹿児島大学（鹿児島県鹿児島市）
- Data Source
  KAKENHI-PROJECT-16K05263
[Presentation] 一般べーテ木におけるグローバーウォークの周期性2017
- Author(s)
  谷口哲至
- Organizer
  COS2017
- Data Source
  KAKENHI-PROJECT-16K05263
[Presentation] 辺符号グラフとホフマングラフ2016
- Author(s)
  谷口哲至
- Organizer
  名古屋組合せ論セミナー
- Place of Presentation
  愛知県産業労働センター（愛知県名古屋市）
- Invited
- Data Source
  KAKENHI-PROJECT-16K05263
[Presentation] スターコンプリメントテクニックと最小固有値が－２以上のグラフの生成2016
- Author(s)
  谷口哲至
- Organizer
  Mathematicaを使った数学
- Place of Presentation
  アルゴグラフィックス（東京都中央区）
- Data Source
  KAKENHI-PROJECT-16K05263
[Presentation] A representation of Hoffman graphs2016
- Author(s)
  Tetsuji Taniguchi
- Organizer
  Korea-Japan Workshop on Algebra and Combinatorics
- Place of Presentation
  Pusan National University, Korea
- Year and Date
  2016-01-28
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-25400217
[Presentation] あるグラフクラスタリングとグラフの最小固有値2016
- Author(s)
  谷口哲至
- Organizer
  組合せ論サマースクール
- Place of Presentation
  下呂市民会館（岐阜県下呂市）
- Data Source
  KAKENHI-PROJECT-16K05263
[Presentation] Hoffman graphs and edge-signed graphs2015
- Author(s)
  Tetsuji Taniguchi
- Organizer
  8th Slovenian Conference on Graph Theory
- Place of Presentation
  Kranjska Gora、スロベニア
- Year and Date
  2015-06-21
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-25400217
[Presentation] グラフとその最小固有値2015
- Author(s)
  谷口哲至
- Organizer
  Intersection of Pure Mathematics and Applied Mathematics VIII: Special
- Place of Presentation
  九州大学伊都キャンパス数理学教育研究棟中セミナー室7（福岡県福岡市）
- Year and Date
  2015-02-20
- Invited
- Data Source
  KAKENHI-PROJECT-25400217
[Presentation] A representation of Hoffman graphs2015
- Author(s)
  Tetsuji Taniguchi
- Organizer
  Systems of Lines: Applications of Algebraic Combinatorics
- Place of Presentation
  Worcester Polytechnic Institute Worcester, MA, USA
- Year and Date
  2015-08-10
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-25400217
[Presentation] 辺符号グラフとホフマングラフ2015
- Author(s)
  谷口哲至
- Organizer
  RIMS共同研究『デザイン、符号、グラフおよびその周辺』
- Place of Presentation
  京都大学（京都府京都市）
- Year and Date
  2015-07-08
- Data Source
  KAKENHI-PROJECT-25400217
[Presentation] ホフマングラフとグラフの階層構造2014
- Author(s)
  谷口哲至
- Organizer
  広島組合せ論セミナー
- Place of Presentation
  広島工業大学（広島県広島市）
- Year and Date
  2014-11-10
- Data Source
  KAKENHI-PROJECT-25400217
[Presentation] グラフ理論における諸問題の紹介２2014
- Author(s)
  谷口哲至
- Organizer
  第一回広島組合せ論セミナー
- Place of Presentation
  広島工業大学
- Data Source
  KAKENHI-PROJECT-25400217
[Presentation] グラフの最小固有値2014
- Author(s)
  谷口哲至
- Organizer
  日本数学会中四国支部例会
- Place of Presentation
  島根大学
- Data Source
  KAKENHI-PROJECT-25400217
[Presentation] ホフマングラフとグラフの階層構造2014
- Author(s)
  谷口哲至
- Organizer
  山陰基礎論・解析学セミナー 2014
- Place of Presentation
  米子工業高等専門学校
- Data Source
  KAKENHI-PROJECT-25400217
[Presentation] ホフマングラフとグラフの階層構造2014
- Author(s)
  谷口哲至
- Organizer
  大阪組合せ論セミナー
- Place of Presentation
  大阪駅前第２ビル６階（大阪府大阪市）
- Year and Date
  2014-08-23
- Invited
- Data Source
  KAKENHI-PROJECT-25400217
[Presentation] Hoffman graphs and edge-signed graphs2013
- Author(s)
  谷口哲至
- Organizer
  第３０回代数的組合せ論シンポジウム
- Place of Presentation
  静岡大学
- Data Source
  KAKENHI-PROJECT-25400217
[Presentation] ホフマングラフとグラフの階層構造2013
- Author(s)
  谷口哲至
- Organizer
  組合せ論サマースクール2013
- Place of Presentation
  岩手県盛岡市ホテル大観
- Data Source
  KAKENHI-PROJECT-25400217
[Presentation] ホフマングラフとグラフの階層構造2013
- Author(s)
  谷口哲至
- Organizer
  離散数学とその応用研究集会2013
- Place of Presentation
  山形市保健センター・視聴覚室
- Data Source
  KAKENHI-PROJECT-25400217
[Presentation] On graphs whose smallest eigenvalue is at least-32008
- Author(s)
  谷口哲至
- Organizer
  Geometric and Algebraic Combinatorics 4
- Place of Presentation
  Oisterwijk, オランダ王国
- Year and Date
  2008-08-21
- Data Source
  KAKENHI-PROJECT-17340020
[Presentation] On graphs with the smalleset eigenvelue at least-1-square root 22007
- Author(s)
  谷口哲至
- Organizer
  Sixth Slovenian International Conference on Graph Theory
- Place of Presentation
  Bled, スロベニア
- Year and Date
  2007-06-26
- Data Source
  KAKENHI-PROJECT-17340020
[Presentation] The smallest eigenvalues of the line graphs of some trees -- Cvetkovic and Stevanovic's Question --
- Author(s)
  谷口哲至
- Organizer
  第３１回代数的組合せ論シンポジウム
- Place of Presentation
  東北大学片平さくらホール 2階会議室（宮城県仙台市）
- Year and Date
  2014-06-19 – 2014-06-20
- Data Source
  KAKENHI-PROJECT-25400217
[Presentation] Hoffman graphs with the smallest eigenvalue at least -3
- Author(s)
  谷口哲至
- Organizer
  Workshop on Statistical Designs and Related Combinatorics 2014
- Place of Presentation
  Kinosaki International Arts Center（兵庫県城崎市）
- Year and Date
  2014-12-13 – 2014-12-15
- Data Source
  KAKENHI-PROJECT-25400217
[Presentation] The smallest eigenvalues of the line graphs of some trees -- Cvetkovic and Stevanovic's Question --
- Author(s)
  谷口哲至
- Organizer
  離散数学とその応用研究集会
- Place of Presentation
  新潟総合テレビ　ゆめディア301～303（新潟県新潟市）
- Year and Date
  2014-08-20 – 2014-08-22
- Data Source
  KAKENHI-PROJECT-25400217

1. MUNEMASA Akihiro (50219862)

# of Collaborated Projects: 4 results

# of Collaborated Products: 3 results
2. IMAI Hideo (10093668)

# of Collaborated Projects: 2 results

# of Collaborated Products: 0 results
3. URAKAWA Hajime (50022679)

# of Collaborated Projects: 2 results

# of Collaborated Products: 0 results
4. TAYA Hisao (40257241)

# of Collaborated Projects: 2 results

# of Collaborated Products: 0 results
5. BETSUMIYA Koichi (60364684)

# of Collaborated Projects: 2 results

# of Collaborated Products: 0 results
6. Seto Michio (30398953)

# of Collaborated Projects: 2 results

# of Collaborated Products: 2 results
7. HARADA Masaaki (90292408)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
8. ASOH Toru (00111352)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
9. Sano Yoshio (20650261)

# of Collaborated Projects: 1 results

# of Collaborated Products: 3 results
10. Tanaka Hajime (50466546)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
11. Suda Sho (30710206)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
12. Gavrilyuk Alexander (20897946)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
13. 細川卓也 (90553579)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
14. 阿部敏一 (40749157)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
15. 瀬川悦生

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results

TANIGUCHI Tetsuji 谷口 哲至

Taniguchi Tetsuji 谷口 哲至

Research Projects

Research Products

Co-Researchers

Characterization and classification of integrable algebraic structures by algebraic graph theory.Principal Investigator

Principal Investigator

Project Period (FY)

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Functional analysis approach to time evolution of graphs and its application

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Study on complex spherical codes and designs

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On Characterisations and Classifications of graphs by their EigenvaluesPrincipal Investigator

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A elucidation of the structure of graphs by Algebraic Graph Theory and Spectral Graph TheoryPrincipal Investigator

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Applications of algebraic methods in coding theory to combinatorial designs and discrete geometry

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[Journal Article] On graphs with the smallest eigenvalue at least -1-√2, part III2019

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DOI

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[Journal Article] A quantum walk induced by Hoffman graphs and its periodicity2019

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[Journal Article] Periodicity of Grover walks on generalized Bethe trees2018

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[Journal Article] GRAM MATRICES OF REPRODUCING KERNEL HILBERT SPACES OVER GRAPHS II (GRAPH HOMOMORPHISMS AND DE BRANGES-ROVNYAK SPACES)2015

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[Journal Article] Edge-signed graphs with smallest eigenvalue greater than -22015

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[Journal Article] On the smallest eigenvalues of the line graphs of some trees.2015

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[Journal Article] Gram matrices of reproducing kernel Hilbert spaces over graphs2014

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NAID

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[Journal Article] Fat Hoffman graphs with smallest eigenvalue greater than -32014

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DOI

TANIGUCHI Tetsuji 谷口哲至

Taniguchi Tetsuji 谷口哲至