Updated on 2024/02/16

写真a

 
UEHARA Takato
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Associate Professor
Position
Associate Professor
External link

Degree

  • 数理学 ( 九州大学 )

Research Interests

  • Dynamical system

  • Complex dynamical system

  • Entropy

Research Areas

  • Natural Science / Basic analysis  / Analysis

Education

  • Kyushu University   大学院数理学府   数理学専攻博士課程

    2007.4 - 2010.3

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  • Kyushu University   大学院数理学府   数理学専攻修士課程

    2005.4 - 2007.3

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  • Kyushu University   理学部   数学科

    2001.4 - 2005.3

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Research History

  • Okayama University   大学院自然科学研究科   Associate Professor

    2018.9

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  • Saga University   大学院工学系研究科   Associate Professor

    2014.4 - 2018.8

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  • Niigata University   自然科学系   Assistant Professor

    2012.4 - 2014.3

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  • Tohoku University   Graduate School of Science, Department of Mathematics, Geometry   Assistant Professor

    2011.4 - 2012.3

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Professional Memberships

 

Papers

  • Siegel disks on rational surfaces Reviewed

    Takato Uehara

    Rendiconti Lincei - Matematica e Applicazioni   34 ( 1 )   235 - 263   2023.8

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:European Mathematical Society - EMS - Publishing House GmbH  

    DOI: 10.4171/rlm/1005

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  • On a gluing construction of K3 surfaces Invited

    T. Uehara, T. Koike

    2022   69 - 76   2023.1

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    Language:Japanese   Publishing type:Research paper (international conference proceedings)  

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  • A gluing construction of projective K3 surfaces Reviewed

    T. Koike, T. Uehara

    Épijournal de Géométrie Algébrique   6   2022.7

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  • Automorphism groups of rational surfaces Reviewed

    Takato Uehara

    Journal of Pure and Applied Algebra   224 ( 1 )   411 - 422   2020.1

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

    DOI: 10.1016/j.jpaa.2019.05.013

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  • On an expression of neighborhoods around elliptic curves Reviewed

    T. Koike, T. Uehara

    RIMS Kôkyûroku Bessatsu   B78   211 - 224   2020

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    Publishing type:Research paper (scientific journal)  

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  • On a question of Gromov about the Wirtinger inequalities Reviewed

    T. Kondo, T. Toyoda, T. Uehara

    Geom. Dedicata   195 ( 1 )   203 - 214   2018

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    Language:English   Publishing type:Research paper (scientific journal)  

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  • Rational surface automorphisms preserving cuspidal anticanonical curves Reviewed

    Takato Uehara

    MATHEMATISCHE ANNALEN   365 ( 1-2 )   635 - 659   2016.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER HEIDELBERG  

    This article is concerned with automorphisms on rational surfaces. We develop a method for constructing automorphisms in terms of the concept of realization of orbit data, and show that any automorphism preserving a cuspidal anticanonical curve is constructed from a realization of orbit data. Moreover, some properties of automorphisms are discussed.

    DOI: 10.1007/s00208-015-1275-z

    Web of Science

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  • Rational surface automorphisms with positive entropy Reviewed

    Takato Uehara

    ANNALES DE L INSTITUT FOURIER   66 ( 1 )   377 - 432   2016

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ANNALES INST FOURIER  

    The aim of this paper is to construct rational surface automorphisms with positive entropy by means of the concept of orbit data. The concept enables us to introduce some mild and verifiable condition, and to show that if an orbit data satisfies the condition, then there exists an automorphism realizing the orbit data. Applying this result, we describe the set of entropy values of the rational surface automorphisms in terms of Weyl groups.

    Web of Science

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  • Isolated periodic solutions to Painlevé VI equation Reviewed

    K.Iwasaki, T. Uehara

    RIMS Kôkyûroku Bessatsu   B37   69 - 79   2013

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    Language:English   Publisher:Kyoto University  

    CiNii Article

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  • On the structure of rational surface automorphism groups

    T. Uehara

    RIMS Kôkyûroku   1807   31 - 38   2012

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    Language:Japanese   Publisher:Kyoto University  

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    Other Link: http://hdl.handle.net/2433/194434

  • Dynamics on rational surfaces

    T. Uehara

    RIMS Kôkyûroku   1765   137 - 153   2011

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    Language:Japanese   Publisher:Kyoto University  

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    Other Link: http://hdl.handle.net/2433/171410

  • Periodic points for area-preserving birational maps of surfaces Reviewed

    Katsunori Iwasaki, Takato Uehara

    MATHEMATISCHE ZEITSCHRIFT   266 ( 2 )   289 - 318   2010.10

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

    It is a basic problem to count the number of periodic points of a surface mapping, since the growth rate of this number as the period tends to infinity is an important dynamical invariant. However, this problem becomes difficult when the map admits curves of periodic points. In this situation we give a precise estimate of the number of isolated periodic points for an area-preserving birational map of a projective complex surface.

    DOI: 10.1007/s00209-009-0570-3

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  • An ergodic study of Painleve VI Reviewed

    Katsunori Iwasaki, Takato Uehara

    MATHEMATISCHE ANNALEN   338 ( 2 )   295 - 345   2007.6

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

    An ergodic study of Painleve VI is developed. The chaotic nature of its Poincare return map is established for almost all loops. The exponential growth of the numbers of periodic solutions is also shown. Principal ingredients of the arguments are a moduli-theoretical formulation of Painleve VI, a Riemann-Hilbert correspondence, the dynamical system of a birational map on a cubic surface, and the Lefschetz fixed point formula.

    DOI: 10.1007/s00208-006-0077-8

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  • Chaos in the sixth Painlevé equation Reviewed

    K.Iwasaki, T. Uehara

    RIMS Kôkyûroku Bessatsu   B2   73 - 88   2007

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    Language:English  

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MISC

  • Entropy of dynamical systems on complex surfaces

    T. Uehara

    Sugaku   74   301 - 321   2022

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (other)  

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Presentations

  • On dynamical degrees of birational mappings Invited

    Takato Uehara

    French-Japanese Workshop of Real and Complex Dynamics  2023.9.14 

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    Event date: 2023.9.11 - 2023.9.15

    Language:English   Presentation type:Oral presentation (general)  

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  • On dynamical degrees of birational mappings Invited

    T. Uehara

    RIMS Workshop Complex Dynamics and Related Topics  2022.12.14 

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    Event date: 2022.12.12 - 2022.12.16

    Language:English   Presentation type:Oral presentation (general)  

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  • Dynamical degrees of birational mappings on projective surfaces Invited

    T. Uehara

    2024.1.19 

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    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Dynamical spectrum on projective surfaces Invited

    T. Uehara

    2024.1.18 

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    Language:English   Presentation type:Oral presentation (general)  

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  • 射影曲面上の双有理写像による力学系スペクトルについて

    上原 崇人

    京都力学系セミナー  2023.11.24 

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    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

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  • On dynamical degrees of birational mappings

    Takato Uehara

    2023.5.29 

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    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

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  • On a gluing construction of K3 surfaces Invited

    Takato Uehara

    2022.10.19 

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    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A gluing construction of projective K3 surfaces Invited

    Takato Uehara

    Aspects of Complex Dynamics  2021.12.16 

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    Language:English   Presentation type:Oral presentation (general)  

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  • On maximal entropy measures for birational maps on compact complex surfaces Invited

    上原 崇人

    Complex Dynamics and Related Topics  2020.12.10 

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    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Dynamical degrees of birational maps on complex surfaces Invited

    Takato Uehara

    Bifurcation and stability in complex dynamics  2019.12.9 

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  • A gluing construction of K3 surfaces Invited

    Takato Uehara

    Differential Systems: from theory to computer mathematics  2019.12.5 

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    Language:English   Presentation type:Oral presentation (general)  

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  • Siegel disks for rational surface automorphisms with positive entropy Invited

    Takato Uehara

    Geometric Complex Analysis on Foliations and Dynamics  2019.11.26 

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    Language:English   Presentation type:Oral presentation (general)  

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  • 複素曲面上の力学系 Invited

    上原 崇人

    日本数学会2019年度会  2019.3.18 

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    Language:Japanese   Presentation type:Oral presentation (invited, special)  

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  • Dynamical systems on complex surfaces Invited

    Takato Uehara

    Workshop on Complex Analytic and Algebraic Methods in Dynamics  2019.1.15 

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    Language:English   Presentation type:Oral presentation (general)  

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  • K3曲面の構成と力学系への応用 Invited

    上原 崇人

    可積分系理論から見える数理構造とその応用  2018.9.6 

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    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 有理曲面を用いた超越的K3曲面の構成について Invited

    上原 崇人

    複素領域における微分方程式とその周辺  2018.8.29 

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    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A construction of non-projective K3 surfaces from rational surfaces

    UEHARA Takato

    Complex geometry and complex dynamics in higher dimensions  2018.6.27 

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  • A construction of transcendental K3 surfaces

    UEHARA Takato

    The 13th Kagoshima Algebra-Analysis-Geometry Seminar  2018.2.15 

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  • On a construction of non-projective K3 surfaces

    UEHARA Takato

    Line Bundles and Theories on Canonical Kähler Metrics  2018.1.31 

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  • Wirtinger不等式に関するGromovの問題について

    上原 崇人

    測地線及び関連する諸問題  2018.1.6 

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  • 複素曲面のダイナミカルスペクトラム

    上原 崇人

    葉層構造の幾何学とその応用  2017.12.16 

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  • On a construction of transcendental K3 surfaces: application of Arnol’d’s theorem

    UEHARA Takato

    RIMS Workshop on Complex Dynamics 2017  2017.12.13 

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  • Arnol'dの定理を用いた複素K3曲面の構成

    上原 崇人

    第60回函数論シンポジウム  2017.10.7 

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  • 複素K3曲面の構成について

    上原 崇人

    第52回函数論サマーセミナー  2017.9.7 

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  • On automorphisms preserving meromorphic two forms

    UEHARA Takato

    Dynamics and Analysis in Several Complex Variables  2017.3.21 

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  • On automorphisms of rational surfaces with positive entropy

    上原 崇人

    多変数関数論冬セミナー  2016.12.16 

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  • Rigidity of automorphisms on rational surfaces

    UEHARA Takato

    Complex dynamical systems and related topics  2016.12.13 

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  • ジーゲル領域をもつ有理曲面上の自己同型写像

    上原 崇人

    アクセサリー・パラメーター研究会  2016.3.24 

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  • On the topological entropies for automorphisms on rational surfaces

    上原 崇人

    複素領域の微分方程式、漸近解析とその周辺  2016.3.9 

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  • Siegel domains for rational surface automorphisms with positive entropy

    UEHARA Takato

    RIMS Workshop on Complex Dynamics  2015.12.11 

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  • Entropy values of automorphisms on rational surfaces

    UEHARA Takato

    Mini-workshop on moduli spaces and its related topics  2015.5.13 

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  • Isolated periodic points for area-preserving surface mappings

    UEHARA Takato

    Differential and Complex Geometry Seminar  2015.3.30 

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  • Rational Surface Automorphisms with Siegel Disks

    上原 崇人

    複素力学系の総合的研究  2014.12.10 

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  • On rational surface automorphisms with positive entropy

    UEHARA Takato

    Symmetries of Kähler manifolds, dynamics and moduli spaces  2014.9.25 

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  • On rational surface automorphisms preserving cuspidal anticanonical curves

    UEHARA Takato

    Moduli spaces and self-maps  2014.3.4 

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  • パンルヴェ第6方程式の力学系について

    上原 崇人

    第7回佐賀大学数学研究交流会  2014.2.6 

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  • On automorphism groups of rational surfaces

    上原 崇人

    第三回若手代数複素幾何研究集会  2014.1.8 

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  • On rational surface automorphisms

    上原 崇人

    射影多様体の幾何とその周辺2013  2013.11.2 

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  • Siegel disks on rational surfaces

    UEHARA Takato

    New Developments in Complex Dynamical Systems  2012.12.13 

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  • The entropy values of automorphisms on rational surfaces

    UEHARA Takato

    Various Aspects on the Painlevé Equations  2012.11.30 

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  • Construction of automorphisms on rational surfaces

    上原 崇人

    第10回アフィン代数幾何学研究集会  2012.9.6 

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  • On automorphisms of rational surfaces

    UEHARA Takato

    Korea-Japan Joint Conference in Algebraic Geometry  2012.8.20 

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  • Constructing automorphisms of rational surfaces

    UEHARA Takato

    Interactions between continuous and discrete holomorphic dynamical systems  2012.7.10 

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  • Rational surface の自己同型写像について

    上原 崇人

    九州代数幾何若手勉強会  2012.3.14 

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  • Ergodic theory of Painlevé VI

    UEHARA Takato

    The 4th International GCOE symposium on "Weaving Science Web beyond Particle-Matter Hierarchy"  2012.2.21 

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  • On rational surface automorphisms

    上原 崇人

    複素力学系の総合的研究  2012.1.25 

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  • Rational surface automorphisms preserving cuspidal anticanonical curves

    UEHARA Takato

    Automorphisms of algebraic varieties - Dynamics and Arithmetic  2011.12.20 

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  • Rational surface automorphisms with positive entropy

    可積分系数理の多様性  2010.8.20 

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  • Construction of rational surface automorphisms with positive entropy

    上原 崇人

    複素力学系とその関連分野の総合的研究  2009.12.18 

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  • 有理曲面上の複素力学系

    上原 崇人

    有理曲面上の複素力学系  2009.8.10 

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  • 有理曲面上の自己同型写像の構成について

    上原 崇人

    2009函数方程式論サマーセミナー  2009.8.1 

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  • 正のエントロピーをもつ有理曲面上の自己同型写像

    上原 崇人

    2008函数方程式論サマーセミナー  2008.8.7 

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  • 面積保存写像の孤立周期点について

    上原 崇人

    玉原特殊多様体研究集会  2008.7.22 

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  • Ergodic theory of Painlevé VI equation

    UEHARA Takato

    The 1st GN Workshop on Differential Galois Theory for Hamiltonian Systems and Related Topics  2008.6.5 

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  • Isolated periodic points in area-preserving surface dynamics

    上原 崇人

    完全WKB解析と超局所解析  2008.5.26 

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  • Periodic solutions to Painlevé VI and S. Saito's fixed point formula

    上原 崇人

    超幾何方程式研究会2008  2008.1.7 

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  • Area-preserving surface dynamics and S. Saito's fixed point formula

    UEHARA Takato

    Complex Dynamics and Related Topics  2007.9.3 

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  • Area-preserving surface dynamics and S. Saito's fixed point formula

    上原 崇人

    2007函数方程式論サマーセミナー  2007.8.6 

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Research Projects

  • Construction of new phase-parameter space correspondence for complex dynamics in dimension two

    Grant number:20H01809  2020.04 - 2025.03

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

    石井 豊, 小木曽 啓示, 上原 崇人, 宍倉 光広, 荒井 迅

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    Grant amount:\16120000 ( Direct expense: \12400000 、 Indirect expense:\3720000 )

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  • Research on random real and complex dynamical systems, semigroups of holomorphic maps and fractal geometry

    Grant number:19H01790  2019.04 - 2024.03

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

    角 大輝, 中西 敏浩, 佐藤 譲, 上原 崇人, 諸澤 俊介, イェーリッシュ ヨハネス, 和田 昌昭

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    Grant amount:\17420000 ( Direct expense: \13400000 、 Indirect expense:\4020000 )

    角はランダム複素力学系の研究を行った。特にシステムの写像らが共通固定点を持つ複雑なランダム複素力学系についても、そのようなシステムのほとんどのものは弱平均安定性を持ちシステムのカオス性が著しく軽減することを示した。その応用として、「ランダム緩和ニュートン法」を考えると、従来の決定論的ニュートン法と比べて多項式の根をある意味で見つけやすくなることを示した。また、マルコフ的ランダム複素力学系の平均安定性や、非有界多項式列のジュリア集合の非一様不完全性を調べた。また、角とイエーリッシュは、実直線上の拡大的写像のランダム力学系を調べ、推移作用素のスペクトルギャップ性を示し、無限遠点に収束する確率の関数やその確率パラメータに関する偏微分の各点ヘルダー指数についてのマルチフラクタル解析を行った。
    佐藤はランダム力学系における新たな間欠性と異常拡散を発見したほか、ランダム力学系理論をジェット気流の時系列解析、機械学習の停滞現象の解析、感染症モデルの解析に応用し、また、雑音誘起現象の存在に関する計算機援用証明を行った。
    中西は有限次元タイヒミュラー空間とその上に作用する写像類群に関する研究を行った。特に2つ穴あきトーラスと種数2の閉曲面のタイヒミュラー空間の元である曲面群のSL(2,R)表現の行列表示を具体的に与え写像類群を有理写像のつくる群として具体的に実現した。上原は特定のクラスの複素曲面の構成およびその上の双有理自己同型写像による力学系の解析を行なった. 有理曲面を用いてK3曲面を構成し複素曲面上の力学系の複雑さを表すエントロピーについて考察した。
    諸澤は超越整関数の半群の力学系の研究を行なった。特に超越整関数の内側合成の研究を行なった。和田はフラクタル幾何学研究支援プログラムであるFractal Gazerを開発し、それを用いて3つの相似変換による相似タイリングを多数発見した。

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  • 有理曲面を用いたK3曲面上の力学系の解析

    Grant number:19K03544  2019.04 - 2023.03

    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)

    上原 崇人

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    Grant amount:\4290000 ( Direct expense: \3300000 、 Indirect expense:\990000 )

    本研究の研究対象は,コンパクト複素曲面上の双正則もしくは双有理自己同型写像による高次元の複素力学系である.
    まず,以前の研究において示した,有理曲面上の双正則自己同型写像による力学系に対するエントロピー値の結果を,今年度は双有理自己同型写像に拡張した.具体的には,あるワイル群の任意の元に対応するスペクトル半径の対数は,適当な有理曲面上の双有理写像のエントロピーとして実現されることを示した.本結果は,豊富に存在することが知られている値に対してそれをエントロピー値として実現する力学系が存在すること,つまり,力学系が豊富に存在することを述べており,今後の研究に大きな影響を与えるものと期待している.
    また,以前に構成したK3曲面を別の角度から考察した.以前の研究では,複素射影平面上で楕円曲線内の9点ブローアップで得られる2つの有理曲面を用意して,楕円曲線の正則管状近傍をのりしろとして2つの有理曲面を貼り合わせることでK3曲面が構成されることを示した.この構成により得られるものは,いわゆるK3曲面のII型退化の近傍を記述した曲面となっている.今年度は,K3曲面のIII型退化の近傍に対応する構成として,2次元射影空間の6点ブローアップで記述される4つの3次曲面を用意して,無限遠3直線の近傍をのりしろとして貼り合わされる曲面について,コホモロジー群がどのようにして得られるかを検証した.この計算は,K3曲面構成へ重要なステップであると考えている.

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  • Analysis of automorphisms on rational surfaces based on entorpy

    Grant number:16K17617  2016.04 - 2020.03

    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)

    Uehara Takato

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

    We construct a family of K3 surfaces in terms of rational surfaces. More precisely, by using two rational surfaces obtained from the blowups of nine points on elliptic curves on projective spaces, we show that a family of K3 surfaces is given by patching two surfaces that are the complements of appropriate tubular neighborhoods of elliptic curves in the rational surfaces. The family contains non-projective K3 surfaces, which enables us to establish the basis for the study of dynamical systems on K3 surfaces.

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  • Painleve systems, hypergeometric systems and dynamical systems

    Grant number:25400102  2013.04 - 2016.03

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

    Iwasaki Katsunori, UEHARA Takato

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    Grant amount:\4940000 ( Direct expense: \3800000 、 Indirect expense:\1140000 )

    Hypergeometric equations are linear differential equations solved by an important class of functions called hypergeometric functions, while in certain sense Painleve equations may be thought of as nonlinear analogues of hypergeometric equations. Because of their nonlinearity, the study of Painleve equations requires various methods from dynamical systems. We constructed the phase space of a Painleve equation and gave a geometric characterization of it as an orbifold Hamiltonian dynamical system. We also discussed periodic solutions to another Painleve equation. As for hypergeometric functions we focused our attention on spacial-value formulas, especially on gamma product formulas, and obtained necessary conditions of arithmetic flavor for the existence of such formulas.

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  • Construction and application of a theory of dynamical systems on complex surfaces

    Grant number:24740096  2012.04 - 2016.03

    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)

    Uehara Takato

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    Grant amount:\4420000 ( Direct expense: \3400000 、 Indirect expense:\1020000 )

    We study dynamical systems of biholomorphic automorphisms on rational surfaces with positive topological entropy. We determine explicitly the determinant values, which are defined for automorphisms preserving anticanonical curves, and show the existence of an abundance of rational surface automorphisms with positive entropy. Moreover, we show the existence of automorphisms on complex surfaces with positive entropy having a given number of Siegel domains, which are observed around fixed points.

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  • Development of Integrable Geometry

    Grant number:23340012  2011.04 - 2015.03

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

    Miyaoka Reiko, KOTANI Motoko, NISHINOU Takeo, UEHARA Taketo, MATSUURA Nozomu, IWASAKI Katsunori, IRITANI Hiroshi, KAJIWARA Kenji, NAGATOMO Yasuyuki, NOMURA Takaaki, YAMADA Kotaro, ISHIKAWA Goo, UMEHARA Masaaki, GUEST Martin, SHODA Toshihiro, FUTAKI Akito, FUJIOKA Atsushi, RASSMAN Wayne, TAMARU Hiroshi

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    Grant amount:\13780000 ( Direct expense: \10600000 、 Indirect expense:\3180000 )

    Isoparametric hypersurfaces with 6 principal curvatures with multiplicity 2 are shown to be homogeneous, which solves one of Yau's problems. As for 4 principal curvature case, we gave a description by using the moment map of spin actions. Transnormal systems are investigated in details.
    We show the non-existence of L2 harmonic 1-form on a complete non-compact stable minimal Lagrangian submanifolds in a Kaheler manifold with positive Ricci curvature. Then the number of non-parabolic ends is less than two, and in the surface case, the genus should vanish. The Floer theory on the intersection of a Lagrangian submanifold with its Hamiltonian deformation is investigated. The Gauss images of isoparametric hypersurfaces in the sphere are Lagrangian submanifolds of complex hyperquadric, and in this case, we show that if the multiplicities of the principal curvatures are bigger than 1, then they are Hamiltonian non-displaceable,

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  • Dynamics on algebraic varieties and Painleve equations

    Grant number:20340036  2008 - 2012

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

    IWASAKI Katsunori, UEHARA Takato, KAJIWARA Kenji, KAMIMOTO Joe, TSUJII Masato, ISHII Yutaka, TSUDA Teruhisa

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    Grant amount:\12870000 ( Direct expense: \9900000 、 Indirect expense:\2970000 )

    We developed a dynamical study of the sixth Painleve equation on the algebro-geometrical and moduli theoretical foundations of the Painleve system. When the parameter lies on the walls of an affine Weyl group, we established the chaotic nature of the system and proved the exponential growth of the number of isolated periodic solutions. To obtain these results, we developed a general theory of periodic points for area-preserving birational maps on a projective surface. Constructing rational surface automorphisms of positive entropy has also been discussed.

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