English
Japanese
Last updated: Dec. 21, 2022
Naoki Fujita
Faculty of Advanced Science and Technology, Kumamoto University
email: fnaoki ``at'' kumamotou.ac.jp
Upcoming talks:
International
Internal
Past talks:
International

Schubert calculus and toric degenerations of flag varieties (short talk),
Toric Degenerations,
Banff International Research Station (BIRS), Banff, Canada,
Dec. 6, 2022.

Schubert calculus and string polytopes,
KTH Combinatorics Seminar,
KTH Royal Institute of Technology (online),
Mar. 16, 2022.

Toric degenerations of Schubert varieties arising from cluster structures,
Quantum Groups and Cluster Algebras,
Center for Quantum Structures in Modules and Spaces (online),
Feb. 17, 2022.

Semitoric degenerations of Richardson varieties arising from cluster structures on flag varieties I, II (lecture series),
Ensemble of Algebra and Geometry Seminar,
online,
Jan. 27 and 28, 2022.

Semitoric degenerations of Richardson varieties from cluster algebras,
Symplectic Monday Seminar,
IBS Center for Geometry and Physics (online),
Dec. 13, 2021.

Marked chainorder polytopes as NewtonOkounkov bodies,
Köln Algebra and Representation Theory Seminar,
Germany (online),
June 15, 2021.

Introduction to NewtonOkounkov bodies from cluster algebras I, II (lecture series),
QSMS Winter school on mirror symmetry and related topics,
Center for Quantum Structures in Modules and Spaces (online),
Feb. 23 and 24, 2021.

Introduction to crystal bases I, II / NewtonOkounkov bodies of flag and Schubert varieties I, II (lecture series),
Combinatorics on Flag Varieties and Related Topics 2021,
Ajou University (online),
Jan. 25 and 26, 2021.

NewtonOkounkov bodies arising from cluster structures and mutations on polytopes,
Legendrians, Cluster algebras, and Mirror symmetry,
Korea (online),
Jan. 13, 2021.

NewtonOkounkov bodies arising from cluster structures,
Online Algebraic Geometry Seminar,
University of Nottingham (online),
Nov. 19, 2020.

NewtonOkounkov polytopes of flag varieties from cluster algebras,
Toric Topology 2019 in Okayama,
Okayama University of Science, Okayama, Japan,
Nov. 20, 2019.

Classification of weak Fano Hessenberg varieties,
Hessenberg varieties 2019 in Osaka,
Osaka City University, Osaka, Japan,
Nov. 8, 2019.

NewtonOkounkov bodies of Schubert varieties and tropicalized cluster mutations (short talk),
Degeneration Techniques in Representation Theory,
Mathematisches Forschungsinstitut Oberwolfach (MFO), Oberwolfach, Germany,
Oct. 10, 2019.

Cluster algebras and NewtonOkounkov bodies I, II, III (lecture series),
Intensive Lecture Series,
IBS Center for Geometry and Physics, Pohang, Korea,
Aug. 26–28, 2019.

NewtonOkounkov bodies of flag varieties from their cluster structures,
Mutations: Mirror Symmetry, Deformations, and Combinatorics,
Banff International Research Station (BIRS), Banff, Canada,
Aug. 13, 2019.

Algebrogeometric aspects of regular Hessenberg varieties and their families,
Hessenberg varieties 2018 in Osaka,
Osaka City University, Osaka, Japan,
Dec. 13, 2018.

NewtonOkounkov bodies, generalized string polytopes and tensor product multiplicities,
Conference on Algebraic Representation Theory 2018,
Tongji University, Shanghai, China,
Dec. 1, 2018.

NewtonOkounkov polytopes and representation theory I, II, III (lecture series),
Intensive Lecture Series,
IBS Center for Geometry and Physics, Pohang, Korea,
Mar. 16 and 19, 2018.

NewtonOkounkov polytopes of flag varieties of classical types,
The 4th Korea Toric Topology Winter Workshop,
Unipark of Jeju National University, Jeju Island, Korea,
Dec. 27, 2016.

NewtonOkounkov polytopes of Schubert varieties and perfect bases with positivity properties,
Conference on Algebraic Representation Theory 2016,
Harbin Institute of Technology, Shenzhen, China,
Dec. 2, 2016.

NewtonOkounkov polytopes of Schubert varieties and folding method,
Geometry & Topology Seminar,
McMaster University, Hamilton, Canada,
Sep. 23, 2016.
Internal

Essential bases of irreducible representations and NewtonOkounkov bodies,
Algebra Session at MSJ Autumn Meeting 2022,
Hokkaido University,
Sep. 14, 2022.

Cluster algebras and toric degenerations,
Osaka Combinatorics Seminar,
Osaka City University Umeda Satellite (hybrid),
Feb. 5, 2022.

Semitoric degenerations of Schubert varieties arising from cluster structures on flag varieties,
Infinite Analysis 21 (IA21) Workshop Around Cluster Algebras,
online,
Sep. 29, 2021.

NewtonOkounkov polytopes of flag varieties and marked chainorder polytopes,
Algebraic Lie Theory and Representation Theory 2021,
online,
June 26, 2021.

NewtonOkounkov bodies arising from cluster structures and associated toric degenerations,
Invited talk in Topology Session at MSJ Spring Meeting 2021,
Keio University (online),
Mar. 16, 2021.

Schubert calculus from polyhedral parametrizations of Demazure crystals,
South Osaka Algebra Seminar,
Osaka (online),
Nov. 13, 2020.

Combinatorial mutations on representationtheoretic polytopes,
Recent Advances in Combinatorial Representation Theory,
RIMS (online),
Oct. 8, 2020.

Toric degenerations arising from Newton–Okounkov bodies and cluster structures,
Invited talk in Topology Session at MSJ Spring Meeting 2020,
Nihon University,
Mar. 16, 2020.
(canceled due to COVID19, only an extended abstract is released)

NewtonOkounkov polytopes of flag varieties and tropicalized cluster mutations,
The 15th Kagoshima AlgebraAnalysisGeometry Seminar,
Kagoshima University,
Feb. 12, 2020.

Recursive constructions of NakashimaZelevinsky polytopes,
Algebra Session at MSJ Autumn Meeting 2019,
Kanazawa University,
Sep. 17, 2019.

Weak Fano Hessenberg varieties from Richardson varieties,
Algebraic Lie Theory and Representation Theory 2019,
Shizuoka,
May 25, 2019.

Tensor product representations from NewtonOkounkov bodies,
The 15th Mathematics Conference for Young Researchers,
Hokkaido University,
Mar. 4, 2019.

NakashimaZelevinsky polytopes from convexgeometric Demazure operators,
South Osaka Algebra Seminar,
Osaka Prefecture University Isite Namba,
Dec. 14, 2018.

Divided difference operators on polytopes and polyhedral realizations of crystal bases,
Aspects of Combinatorial Representation Theory,
RIMS,
Oct. 11, 2018.

Geometric and representationtheoretic aspects of flag BottSamelson varieties,
Geometry, Algebra and Combinatorics in Transformation Group Theory,
RIMS,
June 7, 2018.

Geometry of regular Hessenberg varieties and their families,
Algebraic Lie Theory and Representation Theory 2018,
Nagano,
May 26, 2018.

Folding procedure for NewtonOkounkov polytopes of flag varieties,
The 14th Mathematics Conference for Young Researchers,
Hokkaido University,
Feb. 28, 2018.

Polyhedral realizations of crystal bases and perfect bases with positivity properties,
Representation Theory and Combinatorics,
RIMS,
Oct. 11, 2017.

Comparison between NewtonOkounkov polytopes of Schubert varieties,
Algebraic Lie Theory and Representation Theory 2016,
Nagano,
June 10, 2016.

NewtonOkounkov bodies for BottSamelson varieties and crystal bases,
The 21st Conference on Algebra for Young Researchers in Japan,
Nara Women's University,
Mar. 30, 2016.

NewtonOkounkov bodies of Schubert varieties and polyhedral realizations of crystal bases,
Combinatorial Representation Theory and Related Topics,
RIMS,
Oct. 19, 2015.

Okounkov bodies for BottSamelson varieties and string polytopes for generalized Demazure modules,
Algebraic Lie Theory and Representation Theory 2015,
Okayama,
June 6, 2015.

A model of Schubert polynomials in terms of BottSamelson varieties (survey),
The 3rd Workshop on Schubert Calculus,
Okayama University of Science,
Aug. 27, 2014.
Poster presentations

Convexgeometric divided difference operators and crystal bases,
International Festival in Schubert Calculus,
Sun Yatsen University, Guangzhou, China,
Nov. 9, 2017.

Polyhedral realizations of crystal bases and convexgeometric divided difference operators,
Algebraic Analysis and Representation Theory,
RIMS, Kyoto, Japan,
June 28, 2017.

NewtonOkounkov polytopes of Schubert varieties and polyhedral realizations of crystal bases,
Introductory Workshop in Major Thematic Program on Combinatorial Algebraic Geometry,
Fields Institute, Toronto, Canada,
Aug. 16, 2016.