Akiyoshi Tsuchiya

Talk (International Only):

2024

1. Examining Kempe equivalence via commutative algebra
   • February 29
   • Seminar on Nonlinear Algebra
   • Max Planck Institute for Mathematics in the Sciences (Leipzig, Germany)
     
     

2023

1. Sectional genus of Ehrhart rings and Castelnuovo polytopes
   • February 6
   • One day workshop on Commutative Algebra
   • Waseda University (Tokyo, Japan)
     
     
2. Perfectly contractile graphs and quadratic toric rings
   • March 28--30
   • The 11th Japan-Vietnam Joint seminar on Commutative Algebra
   • Institute of Mathematics, Hanoi (Hanoi, Vietmam)
     
     
3. Algebraic combinatorics on symmetric edge polytopes
   • August 16--18
   • Hypergeometric School 2023
   • Kobe University (Hyogo, Japan)
     
     

2022

1. Ehrhart theory on adjacency polytopes
   • March 3 - 4
   • Mini-Symposium on Lattice Polytopes
   • Online
     
     

2021

1. Ehrhart theory of locally anti-blocking lattice polytopes
   • January 29
   • 12th polymake conference
   • Technische Universität Berlin (Online)
     
     
2. Castelnuovo polytopes
   • April 6 - 9
   • (Polytop)ics: Recent advances on polytopes
   • Max Planck Institute for Mathematics in the Sciences (Online)
     
     
3. Canonical triangulations of enriched order polytopes
   • June 14 -15
   • AlCoVE: an Algebraic Combinatorics Virtual Expedition
   • Online
     
     

2019

1. Two enriched poset polytopes
   • December 10
   • Oberseminar DIGO: Diskrete Mathematik, Geometrie und Optimierung
   • Goethe-Universität Frankfurt (Frankfurt, Germany)
     
     
2. Two enriched poset polytopes
   • November 18 - 21
   • Toric Topology 2019 in Okayama
   • Okayama University of Science (Okayama, Japan)
     
     
3. Locally anti-blocking lattice polytopes and their h*-polynomials
   • October 28 - November 1
   • Commutative Algebra and Lattice Polytopes
   • RIMS (Kyoto, Japan)
     
     
4. Ehrhart theory and interior polynomials
   • July 22 - 26
   • Recent advances in matroids and Tutte polynomials
   • Hokkaido University (Hokkaido, Japan)
     
     

2018

1. Normal Gorenstein Fano polytopes arising from perfect graphs
   • January 10 - 13
   • Joint Mathematics Meetings (AMS Special Session on Combinatorial Commutative algebra and Polytopes)
   • San Diego Convention Center (California, USA)
     
     
2. The reflexive dimension of a (0,1)-polytope
   • February 7
   • SEMIANR, COMBINATORICS
   • KTH Royal Institute of Technology in Stockholm (Stockholm, Sweden)
     
     
3. Refleive polytopes arising from edge polytopes
   • May 20 - 24
   • The Japanese Conference of Combinatorics and its applications (JCCA2018)
   • Sendai International Center (Miyagi, Japan)
   
   
4. Cayley sums and Minkowski sums of 2-convex-normal lattice polytopes
   • July 30 - August 3
   • Algebraic and Geometric Combinatorics on Lattice Polytopes
   • Osaka University (Osaka, Japan)
   
   
5. Polyhedral characteriaations of perfect graphs
   • October 22
   • Facets of Complexity Seminar
   • Technischen Universität Berlin (Berlin, Germany)
   
   
6. Reflexive polytopes arising from (0,1)-polytopes
   • October 24
   • Forschungsseminar Fachgebiet Diskrete Mathematik und Geometrie
   • Technischen Universität Berlin (Berlin, Germany)
   
   

2017

1. Gorenstein simplices and the associated finite abelian groups
   • January 16 - 20
   • Algebraic and Geometric Combinatorics on Convex Polytopes
   • Osaka University (Osaka, Japan)
     
     
2. Gorenstein simplices and the associated finite abelian groups
   • February 8
   • Forschungsseminar Fachgebiet Diskrete Mathematik und Geometrie
   • Technische Universität Berlin (Berlin, Germany)
     
     
3. Gorenstein simplices and the associated finite abelian groups
   • February 14
   • Overseminar Diskrete, Konvexe und Torische Geometrie
   • Otto-von-Guericke-University Magdeburg (Magdeburg, Germany)
     
     
4. Gorenstein simplices with a given δ-polynomial
   • September 14 - 16
   • Interactions with Lattice Polytopes
   • Otto-von-Guericke-University Magdeburg (Magdeburg, Germany)
     
     
5. Normality and levelness of Cayley sums
   • November 12 - 13
   • Berlin-Leipzig Seminar on Algebra, Geometry and Combinatorics
   • Freie Universität Berlin (Berlin, Germany)
     
     

2016

1. Negative coefficients of Ehrhart polynomials
   • January 19
   • Discrete CATS Seminar
   • University of Kentucky (Kentucky, USA)
     
     
2. The possible sign patterns of the coefficients of Ehrhart polynomials
   • February 1
   • Seminar Algebra & Discrete Mathematics
   • University of California, Davis (California, USA)
     
     
3. Volume of Gorenstein Fano polytopes arising from order polytopes and chain polytopes
   • May 21 - 25
   • The Japanese Conference of Combinatorics and its applications (JCCA2016)
   • Kyoto University (Kyoto, Japan)


4. Gorenstein Fano polytopes arising from two poset polytopes
   • August 1 - 5
   • Computational Commutative Algebra and Convex Polytopes
   • RIMS (Kyoto, Japan)


5. Gorenstein Fano polytopes arising from order polytopes and chain polytopes
   • October 31 - November 3
   • Binomial Ideals and Algebraic Statistics
   • Kyoto Seminar House (Kyoto, Japan)

2015

1. Best possible lower bounds on the coefficients of Ehrhart polynomials 
   • July 1 - 10
   • Current Trends on Gröbner Bases -The 50th Anniversary of Gröbner Bases-
   • Hotel Nikko Osaka (Osaka, Japan)


2. Negative coefficients of Ehrhart polynomials 
   • August 25
   • Chonnam National University (Gwangju, Korea)

Posters (International Only)

2015

1. Best possible lower bounds on the coefficients of Ehrhart polynomials
   • October 7 - 10
   • Combinatorial and Experimental Methods in Commutative Algebra and Related Fields
   • University of Osnabrück (Osnabrück, Germany)