Updated on 2025/03/27

写真a

 
Yamasaki Yoshinori
 
Organization
Graduate School of Science and Engineering (Science) Major of Science and Engineering Mathematics and Computer Science Professor
Title
Professor
Contact information
メールアドレス
External link

Degree

  • 博士 (数理学) ( 九州大学 )

Research Interests

  • Zeta Functions

  • Analytic Number Theory

Research Areas

  • Natural Science / Algebra  / Number Theory

Education

  • Kyushu University   Faculty of Mathematics   Doctor's Course

    2005.4 - 2008.3

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  • Kyushu University   Faculty of Mathematics   Master's Course

    2003.4 - 2005.3

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    Country： Japan

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  • Kyushu University   Faculty of Science   Department of Mathematics

    1999.4 - 2003.3

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    Country： Japan

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Research History

  • Ehime University   Graduate School of Science and Engineering   Professor

    2020.10

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  • Eberhard-Karls-Universität Tübingen   Research Visitor

    2017.7 - 2017.9

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  • Max Planck Institute for Mathematics   Research Visitor

    2017.4 - 2017.6

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  • The City College of New York   Research Visitor

    2016.10 - 2017.3

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  • Ehime University   Graduate School of Science and Engineering   Associate Professor

    2013.2 - 2020.9

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  • Ehime University   Graduate School of Science and Engineering   Lecturer

    2011.1 - 2013.1

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  • Ehime University   Graduate School of Science and Engineering   Assistant Professor

    2008.10 - 2010.12

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  • Japan Society for the Promotion of Science   PD, Research Fellowship for Young Scientists

    2008.4 - 2008.9

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  • Japan Society for the Promotion of Science   DC2, Research Fellowship for Young Scientists

    2007.4 - 2008.3

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  • Kyushu University   Faculty of Mathematics   Research Assistant

    2005.4 - 2007.3

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Professional Memberships

Committee Memberships

  • 日本数学会   「数学」編集委員  

    2014.7 - 2018.6   

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    Committee type：Academic society

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Papers

  • Sum formulas for Schur multiple zeta values Reviewed International journal

    Henrik Bachmann, Shin-ya Kadota, Yuta Suzuki, Shuji Yamamoto, Yoshinori Yamasaki

    Journal of Combinatorial Theory, Series A   200   105781   2023.11

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.jcta.2023.105781

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  • Ramanujan Graphs for Post-Quantum Cryptography Reviewed

    Hyungrok Jo, Shingo Sugiyama, Yoshinori Yamasaki

    International Symposium on Mathematics, Quantum Theory, and Cryptography   231 - 250   2021

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    Publishing type：Part of collection (book)   Publisher：Springer Singapore  

    <title>Abstract</title>
    We introduce a cryptographic hash function based on expander graphs, suggested by Charles et al. ’09, as one prominent candidate in post-quantum cryptography. We propose a generalized version of explicit constructions of Ramanujan graphs, which are seen as an optimal structure of expander graphs in a spectral sense, from the previous works of Lubotzky, Phillips, Sarnak ’88 and Chiu ’92. We also describe the relationship between the security of Cayley hash functions and word problems for group theory. We also give a brief comparison of LPS-type graphs and Pizer’s graphs to draw attention to the underlying hard problems in cryptography.

    DOI： 10.1007/978-981-15-5191-8_17

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  • Erratum: Addition : Practical Training in Simple Hückel Theory: Matrix Diagonalization via Tridiagonalization, Cyclobutadiene, and Visualization of Molecular Orbitals (Journal of Chemical Education(2018) 95: 9 (1579−1586) DOI: 10.1021/acs.jchemed.8b00244) Reviewed

    Shin Ichi Nagaoka, Yoshinori Yamasaki, Hiroyuki Teramae, Umpei Nagashima, Tatsunobu Kokubo

    Journal of Chemical Education   97 ( 8 )   2373 - 2374   2020

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society (ACS)  

    © 2018 American Chemical Society. All rights reserved. This paper is an addition to the article "Practical Training in Simple Hückel Theory: Matrix Diagonalization for Highly Symmetric Molecules and Visualization of Molecular Orbitals" by Shin-ichi Nagaoka, Tatsunobu Kokubo, Hiroyuki Teramae, and Umpei Nagashima.1 Yoshinori Yamasaki, from the Department of Mathematics, Faculty of Science and Graduate School of Science and Engineering, Ehime University, Matsuyama 790-8577, Japan, is an author of this addition, together with the authors of the original article. With the addition, the new title of this work is "Practical Training in Simple Hückel Theory: Matrix Diagonalization via Tridiagonalization, Cyclobutadiene, and Visualization of Molecular Orbitals". In our previous study on Hückel molecular-orbital (HMO) calculations,1 we developed a matrix-diagonalization tool that uses tridiagonalization and the inherent symmetry instead of inputting duplicate symmetry information. The practical training in drawing HMOs afforded by this matrix-diagonalization tool is very useful for teaching of undergraduate quantum chemistry as it clearly shows the theoretical conception.1 Three additions to the original article on HMO calculations are included in the Supporting Information of this "Addition" article. First, a mathematical background on using tridiagonalization for matrix diagonalization has been added in order to explain how tridiagonalization preserves the symmetry of degenerate eigenvectors without forcing molecular symmetry onto the HMOs. Second, by using our matrix-diagonalization method, we resolve marked discrepancies in the descriptions in several textbooks with regard to the nodal pattern of degenerate HMOs in square cyclobutadiene.2−5,6a,b The discrepancies have confused chemistry students for a long time and should be fixed. The treatment used to resolve the discrepancies is applied to various planar conjugated cyclic polyenes like cyclooctatetraene. Third, we have improved our Excel-based macros to create elegant views of HMOs by using a graphics-drawing library available on the Internet.7 Reading Sections 1−4 in the Supporting Information first is a good way to become familiar with the additions to our original article. Afterward, if the reader wants a more detailed explanation, he or she might read all the sections in the Supporting Information.

    DOI： 10.1021/acs.jchemed.0c00857

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  • Checkerboard style Schur multiple zeta values and odd single zeta values Reviewed

    Henrik Bachmann, Yoshinori Yamasaki

    Mathematische Zeitschrift   290 ( 3-4 )   1173 - 1197   2018.12

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    DOI： 10.1007/s00209-018-2058-5

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    Other Link： http://link.springer.com/content/pdf/10.1007/s00209-018-2058-5.pdf

  • LPS-type Ramanujan graphs Reviewed

    Hyungrok Jo, Yoshinori Yamasaki

    2018 International Symposium on Information Theory and Its Applications (ISITA)   399 - 403   2018.10

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

    DOI： 10.23919/isita.2018.8664284

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  • On Schur multiple zeta functions: A combinatoric generalization of multiple zeta functions Reviewed

    Maki Nakasuji, Ouamporn Phuksuwan, Yoshinori Yamasaki

    Advances in Mathematics   333   570 - 619   2018.7

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.aim.2018.05.014

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  • An explicit prime geodesic theorem for discrete tori and the hypergeometric functions Reviewed

    Yoshinori Yamasaki

    Mathematische Zeitschrift   289 ( 1-2 )   361 - 376   2018.6

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    DOI： 10.1007/s00209-017-1955-3

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    Other Link： http://link.springer.com/content/pdf/10.1007/s00209-017-1955-3.pdf

  • Ramanujan Cayley Graphs of the Generalized Quaternion Groups and the Hardy–Littlewood Conjecture Reviewed

    Yoshinori Yamasaki

    Mathematical Modelling for Next-Generation Cryptography   159 - 175   2018

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    Language：English   Publishing type：Part of collection (book)   Publisher：Springer Singapore  

    DOI： 10.1007/978-981-10-5065-7_9

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  • RAMANUJAN CAYLEY GRAPHS of FROBENIUS GROUPS Reviewed

    Miki Hirano, Kohei Katata, Yoshinori Yamasaki

    Bulletin of the Australian Mathematical Society   94 ( 3 )   373 - 383   2016.12

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Cambridge University Press  

    We determine a bound for the valency in a family of dihedrants of twice odd prime orders which guarantees that the Cayley graphs are Ramanujan graphs. We take two families of Cayley graphs with the underlying dihedral group of order: one is the family of all Cayley graphs and the other is the family of normal ones. In the normal case, which is easier, we discuss the problem for a wider class of groups, the Frobenius groups. The result for the family of all Cayley graphs is similar to that for circulants: the prime is 'exceptional' if and only if it is represented by one of six specific quadratic polynomials.

    DOI： 10.1017/S0004972716000587

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  • Milnor–Selberg zeta functions and zeta regularizations Reviewed

    Nobushige Kurokawa, Masato Wakayama, Yoshinori Yamasaki

    Journal of Geometry and Physics   64   120 - 145   2013.2

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.geomphys.2012.10.015

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  • Higher regularizations of zeros of cuspidal automorphic L-functions of GLd Reviewed

    Masato Wakayama, Yoshinori Yamasaki

    Journal de Theorie des Nombres de Bordeaux   23 ( 3 )   751 - 767   2011

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Universite de Bordeaux I  

    We establish "higher depth" analogues of regularized determinants due to Milnor for zeros of cuspidal automorphic Lfunctions of GLd over a general number field. This is a generalization of the result of Deninger about the regularized determinant for zeros of the Riemann zeta function.

    DOI： 10.5802/jtnb.785

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  • Arithmetical properties of multiple Ramanujan sums Reviewed

    Yoshinori Yamasaki

    Ramanujan Journal   21 ( 3 )   241 - 261   2010.4

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    In the present paper, we introduce a multiple Ramanujan sum for arithmetic functions, which gives a multivariable extension of the generalized Ramanujan sum studied by D.R. Anderson and T.M. Apostol. We then find fundamental arithmetic properties of the multiple Ramanujan sum and study several types of Dirichlet series involving the multiple Ramanujan sum. As an application, we evaluate higher-dimensional determinants of higher-dimensional matrices, the entries of which are given by values of the multiple Ramanujan sum. © Springer Science+Business Media, LLC 2010.

    DOI： 10.1007/s11139-010-9223-8

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    Other Link： http://link.springer.com/article/10.1007/s11139-010-9223-8/fulltext.html

  • Evaluations of multiple Dirichlet L-values via symmetric functions Reviewed

    Yoshinori Yamasaki

    Journal of Number Theory   129 ( 10 )   2369 - 2386   2009.10

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    We explicitly evaluate a special type of multiple Dirichlet L-values at positive integers in two different ways: One approach involves using of symmetric functions, while the other involves using of a generating function of the values. Equating these two expressions, we derive several summation formulae involving the Bernoulli and Euler numbers. Moreover, values at non-positive integers, called central limit values, are also studied. © 2009 Elsevier Inc. All rights reserved.

    DOI： 10.1016/j.jnt.2009.04.011

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  • A variation of multiple l-values arising from the spectral zeta function of the non-commutative harmonic oscillator Reviewed

    Kazufumi Kimoto, Yoshinori Yamasaki

    Proceedings of the American Mathematical Society   137 ( 8 )   2503 - 2515   2009.8

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Mathematical Society (AMS)  

    A variation of multiple L-values, which arises from the description of the special values of the spectral zeta function of the non-commutative harmonic oscillator, is introduced. In some special cases, we show that its generating function can be written in terms of the gamma functions. This result enables us to obtain explicit evaluations of them. © 2009 American Mathematical Society.

    DOI： 10.1090/S0002-9939-09-09881-5

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  • Ruelle type L-functions versus determinants of Laplacians for torsion free abelian groups Reviewed

    Nobushige Kurokawa, Masato Wakayama, Yoshinori Yamasaki

    International Journal of Mathematics   19 ( 8 )   957 - 979   2008.9

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：World Scientific Pub Co Pte Lt  

    We study Ruelle's type zeta and L-functions for a torsion free abelian group Γ of rank v &lt
    2 defined via an Euler product. It is shown that the imaginary axis is a natural boundary of this zeta function when v = 2, 4 and 8, and in particular, such a zeta function has no determinant expression. Thus, conversely, expressions like Euler's product for the determinant of the Laplacians of the torus ℝv/Γ defined via zeta regularizations are investigated. Also, the limit behavior of an arithmetic function arising from the Ruelle type zeta function is observed. © 2008 World Scientific Publishing Company.

    DOI： 10.1142/S0129167X08004959

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  • Q-Analogues of the Riemann zeta, the Dirichlet L-functions, and a crystal zeta function Reviewed

    Kenichi Kawagoe, Masato Wakayama, Yoshinori Yamasaki, Peter Sarnak

    Forum Mathematicum   20 ( 1 )   1 - 26   2008.1

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Walter de Gruyter GmbH  

    A q-analogue q(s) of the Riemann zeta function (s) was studied in [Kaneko M., Kurokawa N. and Wakayama M.: A variation of Euler's approach to values of the Riemann zeta function. Kyushu J. Math. 57 (2003), 175192] via a certain q-series of two variables. We introduce in a similar way a q-analogue of the Dirichlet L-functions and make a detailed study of them, including some issues concerning the classical limit of q(s) left open in [Kaneko M., Kurokawa N. and Wakayama M.: A variation of Euler's approach to values of the Riemann zeta function. Kyushu J. Math. 57 (2003), 175192]. We also examine a crystal limit (i.e. q 0) behavior of q(s). The q-trajectories of the trivial and essential zeros of (s) are investigated numerically when q moves in (0, 1]. Moreover, conjectures for the crystal limit behavior of zeros of q(s), which predict an interesting distribution of trivial zeros and an analogue of the Riemann hypothesis for a crystal zeta function, are given. © Walter de Gruyter 2008.

    DOI： 10.1515/FORUM.2008.001

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  • Integral representations of $q$-analogues of the Barnes multiple zeta functions Reviewed

    Yoshinori Yamasaki

    Probability and Number Theory — Kanazawa 2005   545 - 558   2007

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Mathematical Society of Japan  

    DOI： 10.2969/aspm/04910545

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  • On $q$-Analogues of the Barnes Multiple Zeta Functions Reviewed

    Yoshinori YAMASAKI

    Tokyo Journal of Mathematics   29 ( 2 )   413 - 427   2006.12

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Tokyo Journal of Mathematics  

    DOI： 10.3836/tjm/1170348176

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  • Integral representations of q-analogues of the Hurwitz zeta function Reviewed

    Masato Wakayama, Yoshinori Yamasaki

    Monatshefte fur Mathematik   149 ( 2 )   141 - 154   2006.10

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    Two integral representations of q-analogues of the Hurwitz zeta function are established. Each integral representation allows us to obtain an analytic continuation including also a full description of poles and special values at non-positive integers of the q-analogue of the Hurwitz zeta function, and to study the classical limit of this q-analogue. All the discussion developed here is entirely different from the previous work in [5]. © Springer-Verlag 2006.

    DOI： 10.1007/s00605-005-0369-1

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    Other Link： http://link.springer.com/article/10.1007/s00605-005-0369-1/fulltext.html

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MISC

Presentations

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Awards

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Research Projects

  • Arithmetic and combinatorial study on multiple zeta functions from the viewpoint of symmetric functions

    2021.4 - 2025.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    Yoshinori Yamasaki

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    Authorship：Principal investigator 

    Grant amount：\4030000 （ Direct Cost: \3100000 、 Indirect Cost：\930000 ）

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  • A study on number theory from the view point of harmonic analysis on graphs

    2019.4 - 2024.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    Hirano Miki, Yamasaki Yoshinori, Haramoto Hiroshi

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    Authorship：Coinvestigator(s) 

    Grant amount：\4550000 （ Direct Cost: \3500000 、 Indirect Cost：\1050000 ）

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  • A study on zeta functions of graphs via harmonic analysis and its applications

    2018.4 - 2022.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    Yoshinori Yamasaki

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    Authorship：Principal investigator 

    Grant amount：\3900000 （ Direct Cost: \3000000 、 Indirect Cost：\900000 ）

    For each finite graph, we have the associated Ihara zeta function from which we can know various properties of the underlying graph. In this study, we first tried to construct new family of Ramanujan graphs which are important from the viewpoint of applications and characterized by the fact that the associated Ihara zeta function satisfies an analogue of the Riemann hypothesis. Specifically, we constructed graphs via quaternion algebras and their orders, and showed that, in some special cases, they are actually Ramanujan. Moreover, we also studied the logarithmic derivative of Ihara zeta function with a representation of the fundamental group and, in some special cases, explicitly calculated the Taylor coefficients at the origin of that, which reflect various features of the underlying graph such as "complexity".

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  • Research on number theory in vew of finite symmetric spaces and the associated graph spectrum

    2016.4 - 2019.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research  Grant-in-Aid for Challenging Exploratory Research

    Hirano Miki, Yamasaki Yoshinori, Haramoto Hiroshi

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    Authorship：Coinvestigator(s) 

    Grant amount：\3510000 （ Direct Cost: \2700000 、 Indirect Cost：\810000 ）

    We have developed a study of spectral distribution problems of Cayley graphs in view of Number Theory. In particular, we give a result on boundary problem of Ramanujancy for some families of Cayley graphs on non-commutative finite groups, which is similar to the case of a family of circulant graphs. Our results suggest an interesting (unknown) relation between theory of graph spectrum and analytic number theory.

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  • Harmonic analysis on graphs and its limit laws from the viewpoint of zeta regularized products

    2015.4 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    Yamasaki Yoshinori

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    Authorship：Principal investigator 

    Grant amount：\3900000 （ Direct Cost: \3000000 、 Indirect Cost：\900000 ）

    The determinant of the graph Laplacian is an important example of the zeta regularized products. In this research, we study the determinants for various graphs via a harmonic analytical method established by Chinta, Jorgenson and Karlsson in 2010. Note that, in the method, the heat kernel on graphs plays a crucial rule. For example, we obtain a refinement of the prime geodesic theorem for discrete tori, which is not of the form of an asymptotic formula. In this context, we also study Ramanujan graphs, whose associated Ihara zeta function satisfies the “Riemann hypothesis”. We show that the problem finding Ramanujan graphs around the complete graph in a family of Cayley graphs of generalized quaternion group is related to the classical Hardy-Littlewood conjecture for primes represented by a quadratic polynomial.

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  • A study on algebraic and analytic behavior of multiple zeta-functions and multiple automorphic L-functions

    2013.4 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    Matsumoto Kohji, TSUMURA HIROFUMI, KANEKO MASANOBU, OHNO YASUO, SHOJI MAYUMI, FURUSHO HIDEKAZU, YAMASAKI YOSHINORI, UMEGAKI YUMIKO, NAKAMURA TAKASHI

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    Authorship：Collaborating Investigator(s) (not designated on Grant-in-Aid) 

    Grant amount：\18070000 （ Direct Cost: \13900000 、 Indirect Cost：\4170000 ）

    The present research has dealt with various multiple series, such as multiple zeta-functions of Euler-Zagier type, a more general class of zeta-functions of root systems, and also the same type of series with Fourier coefficients of modular forms on the numerators. The main results obtained in the period of the present research are the structure theory and functional relations for zeta-functions of root systems, or more general multiple zeta-functions associated with Lie groups; evaluation of values of multiple series involving hyperbolic functions; numerical computations on the zeros multiple zeta-functions; the proof of two types of functional equations for double zeta-functions involving Fourier coefficients of modular forms on the numerator; the idea of desingularized multiple zeta-functions and the development of the theory of p-adic multiple zeta-functions.

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  • A complementary study of zeta regularized products and the associated special functions

    2012.4 - 2015.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)  Grant-in-Aid for Young Scientists (B)

    Yamasaki Yoshinori

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    Authorship：Principal investigator 

    Grant amount：\3250000 （ Direct Cost: \2500000 、 Indirect Cost：\750000 ）

    We study zeta regularized products and the associated special functions, especially their algebraic and analytic properties. For example, we explicitly calculate "higher depth regularized products", which are generalizations of the usual regularized products, of the eigenvalues of the Laplacian on some manifolds. Moreover, we also investigate Ramanujan graphs in association with Ihara zeta functions, which are graph analogues of the zeta regularized products. Since Ramanujan graphs have very strong connectivity properties, it is easily expected that the graph remains to be Ramanujan even if one removes some edges from the complete graph. We can then clarify that the determination of the number of such removable edges are related to some problems on analytic number theory such as the conjecture of Hardy-Littlewood and Bateman-Horn.

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  • A study on multiple zeta function and zeta regularized products

    2009.4 - 2011.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)  Grant-in-Aid for Young Scientists (B)

    Yamasaki Yoshinori

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    Authorship：Principal investigator 

    Grant amount：\3120000 （ Direct Cost: \2400000 、 Indirect Cost：\720000 ）

    We introduced" higher depth zeta regularized products" as generalizations of the usual regularized products and have studied their analytic and algebraic properties. In particular, we have obtained explicit expressions of" higher depth determinants" of the Laplacian on some manifolds. Moreover, we also introduced" Schur multiple zeta functions" as extensions of the Euler-Zagier multiple zeta functions. Several fundamental properties and combinatorial formulas for the zeta functions have been obtained or expected.

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  • A study on q-analogues of zeta functions and related special functions

    2007.4 - 2009.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for JSPS Fellows  Grant-in-Aid for JSPS Fellows

    Yoshinori Yamasaki

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    Grant amount：\1800000 （ Direct Cost: \1800000 ）

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Teaching Experience (On-campus)

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Social Activities

  • Math Game Challenge

    Role(s)： Lecturer

    Ehime University  Junior Doctors Training School  2024.11

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  • Math Game Challenge

    Role(s)： Lecturer

    Ehime University  Junior Doctors Training School  2023.11

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  • Math Game Challenge

    Role(s)： Lecturer

    Ehime University  Junior Doctors Training School  2022.12

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  • Math Game Challenge

    Role(s)： Lecturer

    Ehime University  Junior Doctors Training School  2021.12

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  • Secrets of one-stroke writings

    Role(s)： Lecturer

    Ehime University  Junior Doctors Training School  2020.11

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    Type：Visiting lecture

    File： 一筆書きの秘密.pdf

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  • Let's start from the Pythagorean Theorem

    Role(s)： Lecturer

    Kawanoe High School  Bridge Program between High school and University  2013.7

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    Type：Visiting lecture

    File： kawanoe.pdf

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  • Topics related to Pi

    Role(s)： Lecturer

    Takamatsu-nishi High School  Power-Up Project for Mathematics  2012.10

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    Type：Visiting lecture

    File： project2012trans.pdf

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  • Let's start from the Pythagorean Theorem

    Role(s)： Lecturer

    Matsuyama-chuo High School  Bridge Program between High school and University  2011.12

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    Type：Visiting lecture

    File： koudairenkei.pdf

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  • Let's start from the Pythagorean Theorem

    Role(s)： Lecturer

    Takamatsu-nishi High School  Power-Up Project for Mathematics  2011.11

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    Type：Visiting lecture

    File： project.pdf

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  • A view from Right Triangles

    Role(s)： Lecturer

    Ehime University  Open Campus  2011.8

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    Type：University open house

    File： opencampus.pdf

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  • Mathematical research starting from prime numbers

    Role(s)： Lecturer

    Takamatsu-nishi High School  Power-Up Project for Mathematics  2010.11

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    Type：Visiting lecture

    File： genko.pdf

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  • Let's challenge the One-Stroke Sketch Game!

    Role(s)： Lecturer

    Faculty of Science, Ehime University  Scientific Experiment with Parents!  2009.8

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    Type：University open house

    File： genko.pdf

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Academic Activities