Updated on 2024/06/23
Graduate School of Science Department of Mathematics
Professor 2022.04 - Now
School of Science Department of Mathematics
Professor 2022.04 - Now
博士（理学） （ Sophia University ）
Natural Science / Geometry / GEOMETRY
The Mathematical Society of Japan
Domestic
連携会員 日本学術会議
2023.10 - Now
評議員（中国・四国支部） 日本数学会
2018.03 - 2019.02
拡大幹事会委員 日本数学会幾何学分科会
2011.08 - Now
On the moduli spaces of left-invariant Riemannian metrics on Lie groups --- a report on the one-dimensional case Invited
Hiroshi Tamaru
Proceedings of The 24th International Workshop on Differential Geometry & Related Fields 249 - 257 2023.11
A classification of left-invariant Lorentzian metrics on some nilpotent Lie groups Reviewed
Yuji Kondo, Hiroshi Tamaru
Tohoku Mathematical Journal 75 ( 1 ) 89 - 117 2023.03
左不変リーマン計量のモジュライ空間が1 次元となるLie 群について Invited
部分多様体幾何とリー群作用 2022 記録集 137 - 149 2023
A classification of left-invariant symplectic structures on some Lie groups Reviewed International coauthorship
Luis Pedro Castellanos Moscoso, Hiroshi Tamaru
Beiträge zur Algebra und Geometrie 64 (2023) 471 - 491 2022.05
A Lie theoretic interpretation of realizations of some contact metric manifolds Invited Reviewed
Takahiro Hashinaga, Akira Kubo, Yuichiro Taketomi, Hiroshi Tamaru
New Horizons in Differential Geometry and Its Related Fields 71 - 90 2022.05
A commutativity condition for subsets in quandles --- a generalization of antipodal subsets Invited Reviewed
Akira Kubo, Mika Nagashiki, Takayuki Okuda, Hiroshi Tamaru
Contemporary Mathematics 777 103 - 125 2022.05
Quandles from the viewpoint of symmetric spaces --- a survey Invited
Hiroshi Tamaru
OCAMI Reports 2021 9 100 - 113 2022.02
Codimension one Ricci soliton subgroups of solvable Iwasawa groups Reviewed
Dominguez-Vazquez Miguel, Sanmartin-Lopez Victor, Tamaru Hiroshi
JOURNAL DE MATHEMATIQUES PURES ET APPLIQUEES 152 69 - 93 2021.08（ ISSN:0021-7824 ）
Remarks on totally geodesic complex curves in Hermitian symmetric spaces Invited
Akira Kubo, Takayuki Okuda, Hiroshi Tamaru
Proceedings of The 23rd International Differential Geometry Workshop on Submanifolds in Homogeneous Spaces & Related Topics 129 - 139 2021
Dynkin indices for totally geodesic submanifolds in compact symmetric spaces Invited
Takayuki Okuda, Akira Kubo, Hiroshi Tamaru
Proceedings of the 22nd International Workshop on Differential Geometry of Submanifolds in Symmetric Spaces and Related Problems 195 - 200 2019
Moment maps and isoparametric hypersurfaces in spheres --- some recent results Invited
Shinobu Fujii, Hiroshi Tamaru
Proceedings of the 22nd International Workshop on Differential Geometry of Submanifolds in Symmetric Spaces and Related Problems 2019
Realizations of some contact metric manifolds as Ricci soliton real hypersurfaces Reviewed International coauthorship
Jong Taek Cho, Takahiro Hashinaga, Akira Kubo, Yuichiro Taketomi, Hiroshi Tamaru
Journal of Geometry and Physics 123 221 - 234 2018
Curvature properties of homogeneous real hypersurfaces in nonflat complex space forms Reviewed
Sadahiro Maeda, Hiroshi Tamaru, Hiromasa Tanabe
Kodai Mathematical Journal 41 ( 2 ) 315 - 331 2018
On the nonexistence of left-invariant Ricci solitons --- a conjecture and examples Reviewed
Yuichiro Taketomi, Hiroshi Tamaru
Transformation Groups 23 ( 1 ) 257 - 270 2018
The solvable models of noncompact real two-plane Grassmannians and some applications Invited Reviewed International coauthorship
Jong Taek Cho, Takahiro Hashinaga, Akira Kubo, Yuichiro Taketomi, Hiroshi Tamaru
Springer Proceedings in Mathematics & Statistics 203 311 - 321 2017
Three-dimensional solvsolitons and the minimality of the corresponding submanifolds Reviewed
Takahiro Hashinaga, Hiroshi Tamaru
International Journal of Mathematics 28 ( 6 ) 1750048 2017
On the moduli spaces of left-invariant pseudo-Riemannian metrics on Lie groups Reviewed
Akira Kubo, Kensuke Onda, Yuichiro Taketomi, Hiroshi Tamaru
Hiroshima Mathematical Journal 46 ( 3 ) 357 - 374 2016.11
On Classification of Quandles of Cyclic Type Reviewed
Kamada Seiichi, Tamaru Hiroshi, Wada Koshiro
TOKYO JOURNAL OF MATHEMATICS 39 ( 1 ) 157 - 171 2016.06（ ISSN:0387-3870 ）
Milnor-type theorems for left-invariant Riemannian metrics on Lie groups Reviewed
Takahiro Hashinaga, Hiroshi Tamaru, Kazuhiro Terada
Journal of the Mathematical Society of Japan 68 ( 2 ) 669 - 684 2016.04
The space of left-invariant Riemannian metrics Invited Reviewed
Hiroshi Tamaru
Springer Proceedings in Mathematics & Statistics 154 315 - 326 2016
Flat connected finite quandles Reviewed
Yoshitaka Ishihara, Hiroshi Tamaru
Proceedings of the American Mathematical Society 144 ( 11 ) 4959 - 4971 2016
Homogeneous Ricci soliton hypersurfaces in the complex hyperbolic spaces Reviewed
Takahiro Hashinaga, Akira Kubo, Hiroshi Tamaru
Tohoku Mathematical Journal 68 ( 4 ) 559 - 568 2016
Naturally reductive homogeneous real hypersurfaces in a nonflat complex space form Invited Reviewed
Sadahiro Maeda, Hiroshi Tamaru
Topology and its Applications 196 ( B ) 675 - 683 2015.12
Moment maps and isoparametric hypersurfaces in spheres --- Hermitian cases Reviewed
Shinobu Fujii, Hiroshi Tamaru
Transformation Groups 20 ( 2 ) 417 - 436 2015.06
リー群上の左不変な幾何構造について：モジュライ空間と特別な構造の存在・非存在問題 Invited Domestic conference
名工大幾何学講演会 2024 2024.03
Left-invariant geometric structures on Lie groups and their moduli spaces Invited International conference
Hiroshi Tamaru
The 4th International Conference on Geometry, Analysis, and Numerics in Differential Geometry 2024.02
リー群上の左不変な幾何構造について：モジュライ空間と特別な構造の存在・非存在問題 Invited Domestic conference
立命館大学幾何学セミナー 2024.01
Quandles from the viewpoint of symmetric spaces Invited Domestic conference
Hiroshi Tamaru
2023.11
Quandles from the viewpoint of symmetric spaces Invited International conference
Hiroshi Tamaru
7th Tunisian-Japanese Conference: Geometric and Harmonic Analysis on Homogeneous Spaces and Applications 2023.11
On the moduli spaces of left-invariant Riemannian metrics on Lie groups Invited International conference
Hiroshi Tamaru
Representation Theory and Differential Geometry on homogeneous spaces 2023.09
On the moduli spaces of left-invariant Riemannian metrics on Lie groups Invited International conference
Hiroshi Tamaru
The 21st OCAMI-RIRCM Joint Differential Geometry Workshop 2023.08
On the moduli spaces of left-invariant Riemannian metrics on Lie groups Invited International conference
Hiroshi Tamaru
Mini-Workshop: Global Analysis and Geometry 2023.03
Lie groups whose moduli spaces of left-invariant Riemannian metrics are one-dimensional Invited Domestic conference
Hiroshi Tamaru
2023.03
Geometry of some nilpotent Lie groups with left-invariant metrics Invited Domestic conference
Hiroshi Tamaru
2022.11
Introduction to quandles and discrete symmetric spaces Invited International conference
Hiroshi Tamaru
Geometry of symmetric spaces and group actions 2022.02
Codimension one Ricci soliton subgroups of solvable Iwasawa groups Invited International conference
Hiroshi Tamaru
The 6th China-Japan Geometry Conference 2021.12
Milnor-type theorems for left-invariant pseudo-Riemannian metrics Invited Domestic conference
Hiroshi Tamaru
Workshop: 擬リーマン多様体の幾何の諸相 2021.12
Introduction to quandles from the viewpoint of symmetric spaces Invited Domestic conference
Hiroshi Tamaru
北海道大学幾何学コロキウム 2021.11
Quandles from the viewpoint of symmetric spaces - a survey Invited Domestic conference
Hiroshi Tamaru
カンドルと対称空間 2021.11
Codimension one Ricci soliton subgroups of solvable Iwasawa groups Invited Domestic conference
Hiroshi Tamaru
対称空間と群作用の幾何学 2021.09
Totally geodesic surfaces in symmetric spaces and applications Invited International conference
Hiroshi Tamaru
The 23rd International Differential Geometry Workshop on Submanifolds in Homogeneous Spaces and Related Topics - The 19th RIRCM-OCAMI Joint Differential Geometry Workshop 2021.07
A commutativity condition for subsets in symmetric spaces and quandles Invited Domestic conference
Hiroshi Tamaru
部分多様体論と関連する幾何構造研究の深化と融合 2021.06
Codimension one Ricci soliton subgroups of solvable Iwasawa groups Invited Domestic conference
Hiroshi Tamaru
部分多様体幾何とリー群作用 2020 2021.03
A commutativity condition for subsets in quandles --- a generalization of antipodal subsets Invited Domestic conference
Hiroshi Tamaru
筑波大学微分幾何学セミナー (online) 2021.01
Quandles and discrete symmetric spaces Invited Domestic conference
Hiroshi Tamaru
第15回代数・解析・幾何学セミナー 2020.02
Quandles and discrete symmetric spaces Invited Domestic conference
Hiroshi Tamaru
淡路島幾何学研究集会 2020 2020.01
Left-invariant metrics and submanifold geometry of noncompact symmetric spaces Invited International conference
Hiroshi Tamaru
AMS Special Session on Differential Geometry and Global Analysis, Honoring the Memory of Tadashi Nagano (1930-2017) 2020.01
Geometry of homogeneous hypersurfaces in noncompact symmetric spaces Invited International conference
Hiroshi Tamaru
Symmetry and shape - Celebrating the 60th birthday of Prof. J. Berndt 2019.10
Moment maps and isoparametric hypersurfaces in spheres --- some recent results Invited International conference
Hiroshi Tamaru
The 22nd International Workshop on Differential Geometry of Submanifolds in Symmetric Spaces and Related Problems 2019.08
On the moduli spaces of left-invariant geometric structures Invited International conference
Hiroshi Tamaru
Workshop on geometric analysis and homogeneous geometry 2019.06
Geometry of homogeneous hypersurfaces in noncompact symmetric spaces Invited Domestic conference
Hiroshi Tamaru
第2回水戸幾何小研究集会 2019.06
Moment maps and isoparametric hypersurfaces in spheres Invited International conference
Hiroshi Tamaru
Workshop on the Isoparametric Theory 2019.06
サッカーの幾何学：変分法に基づくゴールキーパーの最適位置 Domestic conference
Hiroshi Tamaru
淡路島幾何学研究集会 2019 2019.01
カンドルおよび対称空間内のある種の部分集合 Invited Domestic conference
Hiroshi Tamaru
部分多様体論・湯沢2018 2018.11
Symmetric spaces, submanifold geometry, and left-invariant metrics Domestic conference
Hiroshi Tamaru
大阪市立大学数学研究所談話会 2018.10
Discrete symmetric spaces, quandles, and their subsets Domestic conference
Hiroshi Tamaru
広島大学数学教室談話会 2018.07
Flat quandles, graphs, and subsets in symmetric spaces Invited Domestic conference
Hiroshi Tamaru
第35回代数的組合せ論シンポジウム 2018.06
Examples of weakly reflective submanifolds in noncompact symmetric spaces International conference
Hiroshi Tamaru
Hiroshima Differential Geometry Day 2018 2018.04
Left-invariant pseudo-Riemannian metrics on some Lie groups Invited International conference
Hiroshi Tamaru
Geometry of Submanifolds and Integrable Systems 2018.03
Flat quandles and finite subsets in symmetric spaces Invited Domestic conference
Hiroshi Tamaru
Hakata Workshop Winter Meeting 2018: Discrete Mathematics and its Applications 2018.02
Left-invariant pseudo-Riemannian metrics on some solvable Lie groups International conference
Hiroshi Tamaru
AMS Special Session on Nilpotent and Solvable Geometry 2018.01
Symmetric spaces, submanifold geometry, and solvmanifolds Invited International conference
Hiroshi Tamaru
Capital Normal University-Hiroshima University Joint Conference on Mathematics 2017.09
Left-invariant metrics and submanifold geometry Invited International conference
Hiroshi Tamaru
Lie Group Actions in Riemannian Geometry 2017.06
A multifaceted study of quandles from the perspective of discrete symmetric spaces and combinatorics
Grant-in-Aid for Challenging Research (Pioneering) 2029
A multifaceted study of quandles from the perspective of discrete symmetric spaces and combinatorics
Grant-in-Aid for Challenging Research (Pioneering) 2028
A multifaceted study of quandles from the perspective of discrete symmetric spaces and combinatorics
Grant-in-Aid for Challenging Research (Pioneering) 2027
A multifaceted study of quandles from the perspective of discrete symmetric spaces and combinatorics
Grant-in-Aid for Challenging Research (Pioneering) 2026
対称空間の幾何学の深化と応用および離散化
Grant-in-Aid for Scientific Research(B) 2026
A multifaceted study of quandles from the perspective of discrete symmetric spaces and combinatorics
Grant-in-Aid for Challenging Research (Pioneering) 2025
対称空間の幾何学の深化と応用および離散化
Grant-in-Aid for Scientific Research(B) 2025
A multifaceted study of quandles from the perspective of discrete symmetric spaces and combinatorics
Grant-in-Aid for Challenging Research (Pioneering) 2024
対称空間の幾何学の深化と応用および離散化
Grant-in-Aid for Scientific Research(B) 2024
カンドルと対称空間と組み合わせ論の横断的研究
Grant-in-Aid for Challenging Research (Pioneering)/(Exploratory) 2023.04
対称空間の幾何学の深化と応用および離散化
Grant-in-Aid for Scientific Research(B) 2023
対称空間の幾何学の深化と応用および離散化
Grant-in-Aid for Scientific Research(B) 2023
対称空間の幾何学の深化と応用および離散化
Grant-in-Aid for Scientific Research(B) 2022
カンドルと対称空間と組み合わせ論の横断的研究
Grant-in-Aid for Challenging Research (Pioneering)/(Exploratory) 2022
リーマン多様体の局所等長埋め込み問題に現れる可積分条件と不変式
Grant-in-Aid for Scientific Research(C) 2022
カンドルと対称空間と組み合わせ論の横断的研究
挑戦的研究 (萌芽) 2019.04
カンドルおよび離散的対称空間の構造理論の構築
Grant-in-Aid for Challenging Research (Pioneering)/(Exploratory) 2016.04
等質リーマン多様体の局所等長埋め込みと可積分条件
Grant-in-Aid for Scientific Research(C) 2016.04
左不変な幾何構造の部分多様体論的研究
Grant-in-Aid for Scientific Research(B) 2014.04
Quandles and discrete symmetric spaces
Grant-in-Aid for Challenging Research (Pioneering)/(Exploratory) 2012.04
Geometry of solvable Lie groups and submanifold geometry
Grant-in-Aid for Young Scientists(B) 2008
対称空間の部分多様体の微分幾何と関連する問題
文部科学省 2020.04
共同利用・共同研究拠点形成事業費補助金（数学研究所）
文部科学省 特色ある共同研究拠点の整備の推進事業～機能強化支援～ 2023.04
数学要論A
2024 Weekly class Undergraduate
数学特別研究2A
2024 Intensive lecture Graduate school
数学特別研究1A
2024 Intensive lecture Graduate school
数理解析学演習1
2024 Intensive lecture Graduate school
数学特別研究5A
2024 Intensive lecture Graduate school
数学特別研究4A
2024 Intensive lecture Graduate school
数学特別研究3A
2024 Intensive lecture Graduate school
数学要論A
2022 Weekly class Undergraduate
位相数学 II 演習
2022 Weekly class Undergraduate
位相数学 II
2022 Weekly class Undergraduate
位相数学 II 演習
2021 Undergraduate
位相数学 II
2021 Undergraduate
幾何学特論 I
2021 Graduate school
幾何学講義 I
2021 Undergraduate
解析 I
2021 Undergraduate
位相数学 I
2020 Undergraduate
位相数学 I 演習
2020 Undergraduate
幾何学講義 IV
2020 Undergraduate
幾何学特論 IV
2020 Graduate school
解析 I
2019 Undergraduate
位相数学 I
2019 Undergraduate
位相数学 I 演習
2019 Undergraduate
基礎数学 B
2019 Undergraduate
数学基礎演習 II
2019 Undergraduate
基礎数学 B
2018 Undergraduate
解析 II
2018 Undergraduate
幾何学特別講義2
Level：Postgraduate
数学特別講義 1
Level：Undergraduate (specialized)
FD活動への貢献 2020
2023
Number of instructed the graduation thesis：2 Number of graduation thesis reviews：2
[Number of instructed the Master's Program] (previous term)：0 [Number of instructed the Master's Program] (letter term)：1
[Number of master's thesis reviews] (chief)：1 [Number of master's thesis reviews] (vice-chief)：0
[Number of doctoral thesis reviews] (chief)：0 [Number of doctoral thesis reviews] (vice-chief)：0
2022
[Number of instructed the Master's Program] (previous term)：1
[Number of master's thesis reviews] (chief)：1 [Number of master's thesis reviews] (vice-chief)：2
[Number of doctoral thesis reviews] (vice-chief)：2
2021
Number of instructed the graduation thesis：1 Number of graduation thesis reviews：1
[Number of instructed the Master's Program] (previous term)：1 [Number of instructed the Master's Program] (letter term)：1
[Number of master's thesis reviews] (chief)：0 [Number of master's thesis reviews] (vice-chief)：3
[Number of doctoral thesis reviews] (chief)：1 [Number of doctoral thesis reviews] (vice-chief)：1
2021
Original item：数学科２年生担任
2020
Original item：数学科１年生担任
日本数学コンクール運営委員会委員長
Role(s)： Consultant, Planner, Logistic support, Report author
Type： Science festival
大阪公立大学数学研究所 日本数学コンクール 2022.04 - Now
SDGs：
Audience： Schoolchildren, Junior high school students, High school students, Teachers
Number of participants：208（人）
日本数学コンクールは、1990年から小中学生および高校生を対象に開催してきたイベント。自由に一般化を考える、正解を用意しない、数学に落とし込むことそのものを問う、といった出題をするという伝統を受け継いでいます。例年6月に出題、8月末締切、12月表彰式、1月にフォローアップセミナーを開催。
2023
foreigners accepted :1
2022
foreigners accepted :1
2021
International Students :1
2020
foreigners accepted :1
International Students :1
2019
foreigners accepted :1
International Students :1
2018
foreigners accepted :1
Job title within the department
Organization for Research Promotion 数学研究所
所長 2023.04