Organization

Seminars, Conferences & Workshops

2025
  • 🇯🇵 多重ゼータ値の諸相 (Various Aspects of Multiple Zeta Values), RIMS, Kyoto​, September 2025.
    Talk given: Recent developments for multiple Eisenstein series.
  • 🇳🇱 Research stay at Amsterdam University, September 2025.
    Talk given (​Algebra, Geometry, and Mathematical Physics Seminar): Multiple zeta values and modular forms.
  • 🇩🇪 Elliptics and Beyond 25, Bethe Center for Theoretical Physics​, Bonn, September 2025.
    Talk given: Recent developments for multiple Eisenstein series.
  • 🇯🇵 第70回 代数学シンポジウム, Kyushu University, August 2025.
    Talk given: sl_2 代数と多重アイゼンシュタイン級数について.
  • 🇯🇵 Kagoshima Mould Seminar, Kagoshima University, August 2025.
    Talk given: Flexion Units.
  • 🇨🇳 4th International Workshop on Multiple Zeta Values and Related Fields, Tongji University, Shanghai, July 2025.
    Talk given: sl2-algebras and multiple Eisenstein series.
  • 🇭🇰 HKU Number Theory Days 2025, The University of Hong Kong, June 2025.
    Talk given: sl2-algebras and multiple Eisenstein series.
  • 🇯🇵 第68回 関西多重ゼータ研究会, Kindai University, June 2025.
  • 🇯🇵 Modular forms and multiple zeta values, Kindai University, February 2025.
  • 🇯🇵 Lectures on multiple zeta values and beyond, Kyushu University, February 2025.

    • 2024
  • 🇯🇵 Seminar on multiple Eisenstein series, Tohoku University, December 2024.
    Talk given: Recent developments and 12 open problems on multiple Eisenstein series.
  • 🇯🇵 関西多重ゼータ研究会第66回, Tohoku University, December 2024.
  • 🇯🇵 2nd Kindai Workshop: Multiple Zeta Values and Modular Forms, Kindai University, November 2024.
  • 🇩🇪 Beyond multiple zeta values, Universität Hamburg, August 2024.
    Talk given: Finite multiple zeta values and their variants.
  • 🇨🇳 ​多重zeta值与L-函数相关领域 研讨会 2024, Anhui Normal University, June 2024.
    Talk given: Formal multiple zeta values and their variants.
  • 🇯🇵 関西多重ゼータ研究会第65回, Tohoku University, May 2024.
  • 🇯🇵 q級数とその周辺, Osaka Institute of Technology, March 2024.
    Talk given: q-analogues of multiple zeta values and polynomial functions on partitions.
  • 🇯🇵 第18回多重ゼータ研究集会, Kindai University, February 2024.
    Talk given: Derivations for quasi-shuffle algebras.
  • 🇯🇵 The 17th Young Mathematicians Conference on Zeta Functions, Kyushu University, February 2024.

    • 2023
  • 🇯🇵 12th JSPS Club Meeting in Japan, Nagoya University, December 2023.
    Talk given: Numbers, infinite sums and why Japan is a great place for certain number theorists.
  • 🇯🇵 Algebraic Number Theory and Related Topics 2023, RIMS, Kyoto​, December 2023.
    Talk given: Formal multiple Eisenstein series and their derivations.
  • 🇯🇵 関西多重ゼータ研究会第63回, Osaka Institute of Technology, Osaka, November 2023.
  • 🇩🇪 ​Modular Forms and Arithmetic Geometry​, Darmstadt University, September 2023.
  • 🇩🇪 Research stay at University of Cologne​, September 2023.
  • 🇯🇵 ​Formalization of multiple Eisenstein series, Kyushu University, June 2023.
    Lecture series given together with Annika Burmester (University of Bielefeld).
  • 🇩🇪 Geometries and Special Functions for Physics and Mathematics​, Bethe Center for Theoretical Physics (Bonn), March 2023.
  • Research stay at National Taiwan University, March 2023.
  • 🇯🇵 第17回多重ゼータ研究集会, Kindai University, February 2023.
  • 🇯🇵 The 16th Young Mathematicians Conference on Zeta Functions, Nagoya University, February 2023.

    • 2022
  • 🇩🇪 Research stay at Max Planck Institute for Mathematics​, August 2022.
  • 🇩🇪 ​Modular forms in number theory and beyond, Bielefeld University, August 2022.
    Talk given: Formal quasimodular forms and formal multiple Eisenstein series
  • 🇩🇪 Research stay at Hamburg University​, August 2022.
  • 🇯🇵 ​多重ゼータ値の諸相, RIMS Kyoto, May 2022.
    Talk given: The zoo of multiple Eisenstein series.
  • 🇯🇵 ​Combinatorial multiple Eisenstein series & polynomial functions on partitions, Kyushu University, April 2022.
    Lecture series given.
  • 🇯🇵 ​第16回多重ゼータ研究集会, Online, February 2022.
  • 🇯🇵 ​The 15th Young Mathematicians Conference on Zeta Functions, Nagoya University, Online, February 2022.
  • 🇩🇪 Seminar arithmetische Geometrie und Zahlentheorie, Universität Hamburg, Online, January 2022.
    Talk given: Connecting modular forms and multiple zeta values via combinatorial multiple Eisenstein series.

    • 2021
  • 🇧🇷 Geometry, Arithmetic and Differential Equations of Periods (GADEPs), Online, October 2021.
    Talk given: Finite multiple zeta values.
  • 🇯🇵 NU Mirai Education Project, Nagoya University, August & September 2021.
    Lectures given: Polya's four step problem solving method & Mathematics in daily life and the wonderful(?) world of artificial intelligence
  • 🇯🇵 解析数論セミナー, Nagoya University, Online, July 2021.
    Talk given: 多重ゼータ値のq類似および形式的な二重アイゼンシュタイン空間の実現.
  • 🇯🇵 関西多重ゼータ研究会第54回, Online, May 2021.
    Talk given: Formal multiple Eisenstein series and formal multiple zeta values.
  • 🇩🇪 Seminar arithmetische Geometrie und Zahlentheorie, Online, May 2021.
    Talk given: Formal multiple Eisenstein series.
  • 🇯🇵 2021 Waseda number theory Conference, Online, March 2021.
    Talk given: Formal quasi-modular forms.
  • 🇯🇵 ​第15回多重ゼータ研究集会, Online, February 2021.
  • 🇯🇵 ​The 14th Young Mathematicians Conference on Zeta Functions, Nagoya University, Online, February 2021.

    • 2020
  • 🇯🇵 ACPMS Seminar (Online), December 2020.
    Talk given: A variant of the double shuffle relations and quasi modular forms.
  • 🇯🇵 2020年度第3回多元数理談話会 (Online), Nagoya University, December 2020.
    Talk given: 多重ゼータ値とそのモジュラー形式との関係 (Multiple zeta values and their relationship to modular forms).
  • 🇯🇵 九大多重ゼータセミナー予定 (Online), Kyushu University, Fukuoka, May 2020.
    Talk given: Multiple Eisenstein series and their Fourier coefficients.
  • 🇯🇵 第13回ゼータ若手研究集会, Toyama University, Toyama, February 2020.
  • 🇯🇵 第13回多重ゼータ研究集会, Kindai University, Osaka, February 2020.
    Talk given: Combinatorial multiple Eisenstein series
  • 🇯🇵 Japan-Taiwan joint workshop on multiple zeta values, 沖縄県青年会館, Naha, Okinawa, February 2020.
    Talk given: q-double zeta values and modular forms
  • 🇯🇵 九大多重ゼータセミナー予定, Kyushu University, Fukuoka, January 2020.
    2 Talks given: Generalized double shuffle equations for (q-)multiple zeta values

    • 2019
  • 🇯🇵 関西多重ゼータ研究会第４6回, Kyoto Sangyo University, Kyoto, December 2019.
  • 🇯🇵 Various Aspects of Multiple Zeta Values, RIMS, Kyoto​, November 2019.
  • 🇯🇵 解析数論セミナー, Nagoya University, Nagoya​, September 2019.
    Talk given: Generalized double shuffle equations in depth two and quasi modular forms.
  • 🇯🇵 日本数学会2019年度秋季総合分科会, 金沢大学, Kanazawa, September 2019.
    Talk given: 有限多重調和q級数の1のベキ根での値と有限および対称多重ゼータ値.
  • 🇬🇧 Research stay at Oxford University, August 2019.
    Talk given: Multiple harmonic q-series at roots of unity and their connection to finite & symmetric multiple zeta values.
  • 🇳🇱 Research stay at Utrecht University, August 2019.
  • 🇩🇪 Research stay at Hamburg University​, August 2019.
  • 🇩🇪 Research stay at Max Planck Institute for Mathematics​, August 2019.
  • 🇯🇵 多重ゼータ研究集会, Kyushu University, Fukuoka, June 2019.
    Talk given: Sum/Some formulas for Schur multiple zeta values.
  • 🇯🇵 関西多重ゼータ研究会第４5回, 大阪体育大学, Osaka, May 2019.
  • 🇯🇵 愛媛大学代数セミナー (Ehime Algebra Seminar), Ehime University, Matsuyama, April 2019.
    Talk given: Multiple harmonic q-series at roots of unity and their connection to finite & symmetric multiple zeta values.
  • 🇺🇸 33rd Automorphic Forms Workshop, Duquesne University, Pittsburgh, March 2019.
    Talk given: Modular forms and multiple zeta values.
  • 🇯🇵 第12回多重ゼータ研究集会 (12-th Multiple zeta values research meeting), Kindai University, Osaka​, February 2019.
  • 🇯🇵 ​The 12th Young Mathematicians Conference on Zeta Functions, Nagoya University, Nagoya, February 2019.
  • 🇯🇵 Arithmetic and Algebraic Geometry 2019, The University of Tokyo, Tokyo, January 2019.

    • 2018
  • 🇯🇵 17th IAR YLC Seminar, Nagoya University, Nagoya​, December 2018.
    Talk given: Numbers, infinite sums and multiple zeta values
  • 🇯🇵 Studium Generale Lecture, Nagoya University, Nagoya​, December 2018.
    Talk given: Numbers, infinite sums and their appearences in daily life
  • 🇯🇵 解析数論セミナー, Nagoya University, Nagoya​, October 2018.
    Talk given: Modular forms and q-analogues of modified double zeta values.
  • 🇯🇵 関西多重ゼータ研究会第４２回 Kyoto Sangyo University, Kyoto, September 2018.
    Talk given: Modular forms and q-analogues of modified double zeta values.
  • 🇯🇵 九大多重ゼータセミナー Kyushu University, Fukuoka, September 2018.
    Talk given: Modular forms and q-analogues of modified double zeta values.
  • 🇯🇵 第26回整数論サマースクール「多重ゼータ値」 Irako Sea-Park & Spa, September 2018.
  • 🇹🇼 2018 Taiwan-Japan Joint Workshop on MZV’s, NCTS, Taipei, August 2018.
  • 🇯🇵 Profinite monodromy, Galois representations and Complex functions RIMS, Kyoto, May 2018.
  • 🇯🇵 Algebra seminar, Tohoku University, Sendai, May 2018.
    Talk given: Multiple harmonic q-series at roots of unity and their connection to finite & symmetrized multiple zeta values.
  • 🇯🇵 解析数論セミナー, Nagoya Unversity, Nagoya​, April 2018.
    Talk given: Checkerboard style Schur multiple zeta values.
  • 🇩🇪 Periods in Number Theory, Algebraic Geometry and Physics, HIM, Bonn, Q1 2018​.
    Talk given: Multiple harmonic q-series at roots of unity and finite & symmetrized multiple zeta values.

    • 2017
  • 🇩🇪 3rd Japanese-German Number Theory workshop, MPIM, Bonn, November 2017.
  • 🇩🇪 Seminar Aachen-Bonn-Köln-Lille-Siegen on Automorphic Forms, Universität zu Köln​, October 2017.
    Talk given: Multiple harmonic q-series at primitive roots of unity and finite multiple zeta values
  • 🇫🇷 CARMA (Algebraic Combinatorics, Resurgence, Moulds and Applications), CIRM, Luminy​, June 2017.
    Talk given: A simultaneous q-analogue of finite and symmetrized multiple zeta values.
  • 🇩🇪 Modular forms are everywhere, MPIM, Bonn​, May 2017.
  • 🇫🇷 French-Japanese Zeta-Functions, Université Lille 1, Lille​​, March 2017.
  • 🇯🇵 第10回ゼータ若手研究集会 (The 10th Young Mathematicians Conference on Zeta Functions) Nagoya Unversity, Nagoya​, February 2017.
    Talk given: Cyclotomic analogues of finite multiple zeta values.
  • 🇯🇵 多重ゼータ研究集会 (Multiple zeta values research meeting) Kindai University, Osaka​, February 2017.
    Talk given: Derivatives of q-analogues of multiple zeta values.
  • 🇯🇵 解析数論セミナー, Nagoya Unversity, Nagoya​, January 2017.
    Talk given: Interpolated Schur multiple zeta values.

    • 2016
  • 🇯🇵 Number Theory Seminar, Tokyo Metropolitan University, Toyko, December 2016.
    Talk given: Interpolated Schur multiple zeta values.
  • 🇯🇵 九大多重ゼータセミナー Kyushu University, Fukuoka, November 2016.
    Talk given: Interpolated Schur multiple zeta values.
  • 🇯🇵 School on Mock Modular Forms and Related Topics, Kyushu University, Fukuoka, November 2016.
  • 🇯🇵 多重ゼータ値の諸相 - "Various aspects of multiple zeta values", RIMS, Kyoto, July 2016.
    Talk given: The double shuffle structure of certain q-analogues of multiple zeta values and the connection to modular forms.

    • 2015
  • 🇩🇪 "Jahrestagung der Deutschen Mathematiker-Vereinigung 2015", Uni Hamburg, September 2015.
    Talk given: A combinatorial approach to classical modular forms inspired by multiple zeta values.
  • 🇩🇪 "Arbeitstagung 2015", MPIM Bonn, June 2015.
  • 🇩🇪 "Oberseminar Algebra und Geometrie", Uni Frankfurt, June 2015.
    Talk given: Multiple zeta values and regularized multiple Eisenstein series.
  • 🇫🇷 "Automorphic forms: advances and applications", CIRM Marseille, May 2015.
  • "Resurgence, Physics and Numbers", Centro di Ricerca Matematica Ennio De Giorgi- Pisa, May 2015.
    Talk given: Multiple zeta values and regularized multiple Eisenstein series.
  • 🇩🇪 "Spring School: Characters of Representations and Modular Forms", MPIM Bonn, March 2015.
  • 🇩🇪 "Forschungsseminar Arithmetische Geometrie", HU Berlin, February 2015.
    Talk given: Multiple zeta values and multiple Eisenstein series.

    • 2014
  • 🇪🇸 "Workshop on Multiple Zeta Values, Modular Forms and Elliptic Motives II", ICMAT Madrid, December 2014.
  • 🇩🇪 "Arithmetic of Eisenstein series", TU Darmstadt, September 2014.
  • 🇩🇪 "Student Conference on Automorphic Forms and Eisenstein Series", TU Darmstadt, September 2014.
    Talk given: Shuffle regularized multiple Eisenstein series and the Goncharov coproduct.
  • 🇪🇸 "Numbers and Physics (NAP2014)", ICMAT Madrid, September 2014.
    Talk given: Shuffle regularized multiple Eisenstein series and the Goncharov coproduct.
  • 🇪🇸 "Clay Mathematics Institute Summer School 2014: Periods and Motives: Feynman amplitudes in the 21st century", ICMAT Madrid, July 2014.
    Talk given: Generating series of multiple divisor sums and other interesting q-series.
  • 🇬🇧 "Building Bridges: 2nd EU/US Summer School + Workshop on Automorphic Forms and Related Topics", University of Bristol, July 2014.
    Talk given: Generating series of multiple divisor sums and other interesting q-series.

    • 2013
  • 🇯🇵 九大整数論セミナー "Kyushu Number Theory seminar", Kyushu University, November 2013.
    Talk given: Multiple divisor functions, their algebraic structure and the relation to multiple zeta values.
    Talk given: Multiple Eisenstein series, their Fourier expansions and multiple divisor functions.
  • 🇪🇸 "Multiple Zeta Values, Multiple Polylogarithms and Quantum Field Theory", ICMAT Madrid, October 2013.
  • 🇩🇪 "Multiple zeta values in mathematics and physics" , Humboldt University Berlin, October 2013.
  • 🇪🇸 "European Science Foundation - Exploratory Workshop: New Approaches To Multiple Zeta Values ", ICMAT Madrid, September 2013.
    Talk given: The algebra of multiple divisor functions and applications to multiple zeta values.
  • 🇬🇧 "Polylogarithms as a Bridge between Number Theory and Particle Physics", EPSRC Durham Symposium, July 2013.
  • 🇩🇪 "Feynman Graphs and Motives", SFB/TRR 45 Bonn-Essen-Mainz, March 2013.
  • 🇩🇪 "Automorphic Forms and L-Functions", TU Darmstadt, March 2013.

    • 2012
  • 🇫🇷 "Amplitudes and Periods", IHÉS Paris, December 2012.
  • 🇬🇧 "Heilbronn Workshop on String Theory and Arithmetic Geometry", University of Bristol, September 2012.
    Talk given: Multiple Eisenstein series.
  • 🇩🇪 "Building Bridges: 1st EU-US conference on Automorphic Forms and related topics", RWTH Aachen University, August 2012.
    Talk given: Multiple Eisenstein series.
  • 🇪🇸 "Periods and Motives in Madrid - A Modern Perspective on Renormalization", ICMAT Madrid, July 2012.
    Talk given: Multiple Eisenstein series.
  • 🇩🇪 "Quantum Field Theory, Periods and Polylogarithms III", Humboldt University Berlin, June 2012.
  • 🇩🇪 "Modular Forms, Mock Theta Functions, and Applications", University of Cologne, February 2012.

    • 2011
  • 🇬🇧 "Workshop on Multiple Zeta Values, Modular Forms and Elliptic Motives", University of Bristol, May 2011.

    • 2008-2016
  • 🇩🇪 "Seminar arithmetische Geometrie und Zahlentheorie", Uni Hamburg (15 talks given).