Activities (International only)

    2024

      Visit to Mateusz Michalek
    • 2.12--2.16
    • University of Konstantz (Konstantz, Germany)

      Visit to Alessio D'Ali
    • 2.19--2.23
    • Politecnico di Milano (Milano, Italy)

      Viva voce for Thomas Hall
    • 5.26--5.28
    • The University of Nottingham (Nottingham, England)

      Visit to Oliver Clarke
    • 5.28--6.1
    • The University of Edinburgh (Edinbrugh, England)

    2023

      JSPS Postdoctoral Fellowships for Research in Japan (Summer program)
      Kieran BHASKARA (McMaster University)
        2023/6/16--2023/8/25

      Invited Speaker at Conference "Combinatorics, geometry and commutative algebra of hyperplane arrangements"
    • 1.16--1.20
    • Kyushu University (Fukuoka, Japan)

      Organizer of Workshop "Characteristic Polynomials of Hyperplane Arrangements and Ehrhart Polynomials of Convex Polytopes" (with Norihiro Nakashima) (postponed from June 2020 to March 2021, from March 2021 to March 2022, and from March 2022 to February 2023, due to outbreak of coronavirus)
    • 2.14--2.17
    • RIMS (Kyoto, Japan)

      Organizer of Workshop "Combinatorial and Algebraic Aspects of Lattice Polytopes" (with Hidefumi Ohsugi)
    • 2.20--2.22
    • Kwansei Gakuin University (Nishinomiya, Japan)

      Visit to Katharina Jochemko, Luis Ferroni and Mariel Supina
    • 6.1--6.10
    • KTH Royal Institute of Technology (Stockholm, Sweden)

      Visit to Robert Davis
    • 8.7--8.12
    • Colgate University (Hamilton, USA)

      Visit to Laura Escobar
    • 8.13--8.19
    • Washington University in St. Louis (St. Louis, USA)

    2022

      JSPS Postdoctoral Fellowships for Research in Japan (Short-term)
      Oliver CLARKE (University of Bristol)
        2022/5/30--2022/11/29
      Thomas HALL (University of Nottingham)
        2022/8/17--2022/12/16

      Invited Speaker at Conference "Mini-Symposium on Lattice Polytopes"
    • 3.3--3.4
    • Online, hosted by Johannes Hofscheier and Katharina Jochemko

      Invited Participant of AIM Workshop "Ehrhart polynomials: inequalities and extremal constructions" (postponed from September 2020 to May 2022, due to outbreak of coronavirus)
    • 5.9--5.13
    • American Institute of Mathematics (San Jose, USA)

      • Visit to Martina Juhnke-Kubitzke
    • 5.16--5.20
    • Osnabrück University (Osnabrück, Germany)

      Visit to Fatemeh Mohammadi
    • 5.23--5.27
    • Ghent University (Ghent, Belgium)

      Organizer of Workshop "Toric Degenerations and Mirror Symmetry in Kumamoto" (with Naoki Fujita)
    • 10.13--10.14
    • Kumamoto City International Center (Kumamoto, Japan)

    2021
      Invited Speaker at Conference "Combinatorics on Flag Varieties and Related Topics 2021"
    • 1.25--1.27
    • Online, hosted by Ajou University (Suwon, Korea)

      Invited Speaker at Conference "Algebraic and Combinatorial Aspects of Polytopes" (AMS Western Sectional Meeting)
    • 5.1
    • Online, hosted by San Francisco State University (San Francisco, USA)

      Speaker at KTH Seminar, Combinatorics
    • 9.15
    • KTH (online)

    2020
      Invited Speaker at 2020 Taipei International Conference on Combinatorics (cancelled due to outbreak of coronavirus)
    • 2.6--2.8
    • Institute of Mathematics, Academia Sinica (Taipei, Taiwan)

      Visit to Fatemeh Mohammadi
    • 2.17--2.23
    • University of Bristol (Bristol, England)

      Visit to Mateusz Michalek (cancelled due to outbreak of coronavirus)
    • 3.22--3.28
    • Max Planck Institute for Mathematics in the Sciences (Leipzig, Germany)

      Visit to Robert Davis (cancelled due to outbreak of coronavirus)
    • 4.20--4.24
    • Colgate University (Hamilton, USA)

      Visit to Janet Page (cancelled due to outbreak of coronavirus)
    • 4.27--5.1
    • University of Michigan (Ann Arbor, USA)

      Invited Speaker at Conference "The McKay correspondence, mutation and related topics"
    • 7.17, 7.24, 7.31, 8.7, 8.14
    • Online

    2019
      Visit to Johannes Hofscheier
    • 8.7--8.10
    • McMaster University (Hamilton, Canada)

      Organizer of Workshop "Mutations: Mirror Symmetry, Deformations, and Combinatorics" (with Johannes Hofscheier and Alexander Kasprzyk)
    • 8.11--8.16
    • Banff International Research Station (Banff, Canada)

      Organizer of Workshop "Commutative Algebra and Lattice Polytopes" (with Hidefumi Ohsugi)
    • 10.28--11.1
    • RIMS (Kyoto, Japan)

      Viva voce for Daniel Cavey
    • 11.27--12.4
    • The University of Nottingham (Nottingham, England)

      Visit to Fatemeh Mohammadi
    • 12.4--12.6
    • University of Bristol (Bristol, England)

    2018
      Visit to Katharina Jochemko
    • 3.21--3.29
    • KTH Royal Institute of Technology (Stockholm, Sweden)

      Visit to Alexander Kasprzyk
    • 3.29--4.6
    • The University of Nottingham (Nottingham, England)

      Visit to FU Berlin, Seminar Talk and PhD Defense of Florian Kohl
    • 7.5--7.6
    • Freie Universität Berlin (Berlin, Germany)

      Visit to Alexander Kasprzyk
    • 8.27--8.31
    • The University of Nottingham (Nottingham, England)

      Visit to Matthias Beck
    • 9.17--9.21
    • San Francisco State University (San Francisco, USA)

    2017
      Visit to Alexander Kasprzyk
    • 2.13--3.1
    • The University of Nottingham (Nottingham, England)

      Invited Speaker of Conference "Interactions with Lattice Polytopes"
    • 9.14--9.16
    • Otto von Guericke University Magdeburg (Magdeburg, Germany)

      Organizer of Mini-Workshop "Lattice Polytopes: Methods, Advances, Applications" (with Takayuki Hibi, Katharina Jochemko, Benjamin Nill)
    • 9.18--9.22
    • Mathematisches Forschungsinstitut Oberwolfach (Oberwolfach, Germany)

      Visit to Mateusz Michalek
    • 12.11--12.15
    • Max Planck Institute for Mathematics in the Sciences (Leipzig, Germany)


    2016
      Speaker at Conference "Workshop on Commutative Algebra -Part II, Local Algebra and Representation theory-"
    • 1.3--1.7
    • VIASM's Villa (Halong bay, Vietnam)

      Organizer of Conference "Computational Commutative Algebra and Convex Polytopes"
    • 8.1--8.5
    • RIMS in Kyoto University (Kyoto, Japan)

      Invited Speaker at Conference "Einstein Workshop on Lattice Polytopes"
    • 12.12--12.15
    • Freie Universität Berlin (Berlin, Germany)


    2015
      Visit to Alexander Kasprzyk
    • 2.9--2.18
    • Imperial College (London, England)

      • Visit to Victor Batyrev
    • 2.25--3.6
    • Universität Tübingen (Tübingen, Germany)

      Speaker at Conference "Lefschetz Properties"
    • 3.7--3.14
    • Goerg-August-Universität Göttingen (Göttingen, Germany)

      Speaker (contributed talk) at Conference "Current Trends on Gröbner Bases"
    • 7.1--7.10
    • Hotel Nikko Osaka (Osaka, Japan)

    2014
      Visit to Benjamin Nill
    • 8.25--9.11
    • Stockholm University (Stockholm, Sweden)

    2013
      Speaker at Conference "AMS sectional meeting (Special session on combinatorial commutative algebra)"
    • 10. 5--10. 6
    • University of Louisville (Louisville, USA)

      Visit to Augstine O'Keefe
    • 10. 7--10. 11
    • University of Kentucky (Lexington, USA)

      Speaker at Conference "AMS sectional meeting (Special session on combinatorial commutative algebra)"
    • 10. 12--10. 13
    • Temple University (Philadelphia, USA)

      Speaker at Conference "International conference on Commutative algebra and its interaction to algebraic geometry and combinatorics"
    • 12. 16--12. 20
    • Institute of Mathematics Hanoi (Hanoi, Vietnam)

    2012
      Speaker at Conference "Shanghai Conference on Algebraic Combinatorics"
    • 8.17-- 8.22
    • Shanghai Jiao Tong University (Shanghai, China)

      Visit to Moscow State University
    • 9.24--10.5
    • Moscow State University (Moscow, Russia)

    2011
      Speaker at Conference "Toric Topology and Automorphic functions"
    • 9. 5-- 9. 9
    • Pacific National University (Khabarovsk, Russia)

      Speaker at Conference "Workshop on Algebraic Combinatorics"
    • 9.15-- 9.19
    • Shanghai Jiao Tong University (Shanghai, China)



    Talks (International only)

    2024
      Difference of Hilbert series of homogeneous monoid algebras and their normalizations
    • 2.19
    • Seminar at Politecnico di Milano (Milano, Italy)

    2023
      Period collapse in characteristic quasi-polynomials of non-central hyperplane arrangements
    • 1.16--1.20
    • Combinatorics, geometry and commutative algebra of hyperplane arrangements (Kyushu University, Japan)

      Characterizing h*-polynomials of lattice simplices with small volumes
    • 6.2
    • ''Ehrhart Day'' (Combinatorics Seminar), KTH Royal Institute of Technology (Stockholm, Sweden)

      • Characterizing h*-polynomials of lattice simplices with small volumes
    • 8.16
    • Combinatorics Seminar at St. Louis, Washington University in St. Louis (St. Louis, USA)

    2022
      Introduction to toric rings arising from combinatorial objects
    • 5.18
    • Colloquium Talk (Universität Osnabrück)

    2021
      Introduction to combinatorial mutations of polytopes and its applications
    • 1.27
    • Combinatorics on Flag Varieties and Related Topics 2021 (Online)

      Combinatorial mutation equivalence of poset polytopes
    • 5.1
    • Algebraic and Combinatorial Aspects of Polytopes (AMS Western Sectional Meeting) (Online)

      Universal inequalities for h*-vectors of lattice polytopes
    • 9.15
    • KTH Seminar, Combinatorics (Online)

    2020
      Newton-Okounkov bodies of flag varieties and combinatorial mutations
    • 8.14
    • The McKay correspondence, mutation and related topics (Online)
    • See YouTube Video

    2019
      Mutation of Fano polygons and singularity contents
    • 8.8
    • Special Geometry-Combinatorics seminar, McMaster University (Hamilton, Canada)

    2018
      Regular unimodular triangulations of dilated empty simplices and Gröbner basis
    • 3.28
    • KTH Combinatorics Seminar, KTH Royal Institute of Technology (Stockholm, Sweden)

      • Finding a new universal condition in Ehrhart theory
    • 7.5
    • Seminar "Facets of Complexity", Freie Universität Berlin (Berlin, Germany)

      • Characterization problem on Ehrhart polynomials of lattice polytopes
    • 9.19
    • AGC Seminar, San Francisco State University (San Francisco, USA)

    2017
      Characterizations for the h*-vectors of lattice polytopes
    • 9.14--9.16
    • Interactions with Lattice Polytopes, Otto von Guericke University Magdeburg (Magdeburg, Germany)

      • Characterizations for the h*-vectors of lattice polytopes
    • 12.14
    • Nonlinear Seminar in MPI, Max Planck Institute Leipzig (Leipzig, Germany)


    2016
      Almost Gorenstein homogeneous domains and their h-vectors
    • 1.3--1.7
    • Workshop on Commutative Algebra -Part II, Local Algebra and Representation theory-, VIASM's Villa (Halong bay, Vietnam)

      On counterexamples of Cayley conjecture for lattice simplices
    • 8.1--8.5
    • Computational Commutative Algebra and Convex Polytopes, RIMS in Kyoto University (Kyoto, Japan)

      Lattice simplices of maximal dimension with a given degree
    • 12.12--12.15
    • Einstein Workshop on Lattice Polytopes, Freie Universität Berlin (Berlin, Germany)


    2015
      Ehrhart polynomials of lattice polytopes
    • 2.13
    • Queen Mary's combinatorics seminar, Queen Mary University of London (London, England)

      • Level properties and WLP on Ehrhart rings of lattice polytopes
    • 3.7--3.14
    • Conference on Lefschetz Properties, Goerg-August-Universität Göttingen (Göttingen, Germany)

      Very ample polytopes and Gröbner Bases
    • 7.1--7.10
    • Current Trends on Gröbner Bases -The 50th Anniversary of Gröbner Bases-, Hotel Nikko Osaka (Osaka, Japan)

    2014
      Smooth Fano polytopes and their primitive collections
    • 1.21-- 1.24
    • Toric Topology 2014 in Osaka, Osaka City University (Osaka, Japan)

      Non-unimodality of δ-vectors of lattice polytopes
    • 5.17-- 5.21
    • Japan Conference on Graph Theory and Combinatorics, Nihon University (Tokyo, Japan)

      Normality and Very Ampleness of Integral Convex Polytopes
    • 7.20-- 7.21
    • Workshop on Applications of Algebraic Geometry and Algebraic Analysis, Kobe University (Kobe, Japan)

    2013
      Ehrhart polynomials of polytopes and orthogonal polynomial systems
    • 7. 1-- 7. 3
    • Design, Codes, Graphs and Related Areas, RIMS in Kyoto University (Kyoto, Japan)

      Minkowski sums of edge polytopes
    • 10. 5--10. 6
    • AMS sectional meeting (Special session on combinatorial commutative algebra), University of Louisville (Louisville, USA)

      Integer decomposition property of dilated polytopes
    • 10. 12--10. 13
    • AMS sectional meeting (Special session on combinatorial commutative algebra), Temple University (Philadelphia, USA)

      Normality of edge rings and Minkowski sums
    • 12. 16--12. 20
    • International conference on Commutative algebra and its interaction to algebraic geometry and combinatorics, Institute of Mathematics Hanoi (Hanoi, Vietnam)

    2012
      Classification of Ehrhart polynomials of integral simplices
    • 7.30-- 8. 3 (poster)
    • Formal Power Series and Algebraic Combinatorics 2012, Nagoya University (Nagoya, Japan)

      Ehrhart polynomials of integral simplices
    • 8.17-- 8.22
    • Shanghai Conference on Algebraic Combinatorics, Shanghai Jiao Tong University (Shanghai, China)

      Lattice multi-polygons
    • 10.2
    • Postnikov Seminar, Moscow State University (Moscow, Russia)

      Edge contractions and minimal flag simplicial spheres
    • 11.16--11.19
    • Toric Topology 2012 in Osaka, Osaka City University (Osaka, Japan)

    2011
      Gorenstein Fano polytopes arising from finite graphs and their Ehrhart polynomials
    • 9. 5-- 9. 9
    • Toric topology and Automorphic functions, Pacific National University (Khabarovsk, Russia)

      Roots of Ehrhart polynomials of reflexive polytopes arising from graphs
    • 9.15-- 9.19
    • Workshop on Algebraic Combinatorics, Shanghai Jiao Tong University (Shanghai, China)

      Ehrhart polynomials of lattice multi-polygons
    • 11.28--11.30
    • Toric Topology 2011 in Osaka, Osaka City University (Osaka, Japan)

    2010
      Smooth Fano polytopes arising from finite graphs
    • 12. 1--12. 3
    • Toric geometry, Toric topology and Combinatorics, Osaka City University (Osaka, Japan)