Research keywords (9)：
Entire functions and Meromorphic functions
, Nevanlinna theory
, Wiman-Valrion theory
, Complex differential equations
, Oscillation and growth
, Complex difference equations
, Complex functional equations
, Complex dynamics
, Hypertranscendency
Research theme for competitive and other funds (28)：
2022 - 2026 A study on value distribution properties of meromorphic functions generated by a wide variety of series and an investigation into their possible algebraic analogues
2010 - 2012 Transplants of Nevanlinna theory to some fields of research
2010 - 2012 「有理型函数論の応用による複素函数方程式の研究」
2007 - 2010 Studies on complex dynamics of transcendental entire functions
2007 - 2009 Research of differential or difference equations appearing in many fields and the value distribution of meromorphic functions or holomorphic curves
2007 - 2009 「離散的函数方程式の有理型函数解の研究」
2006 - 2008 Value distribution theory of meromorphic mappings concerningdefects and its application to uniqueness theorems
2005 - 2007 Analytic study of Painleve equations and a nelated clans of equation
2005 - 2006 Studies on complex dynamics of transcendental entire functions
2004 - 2005 「複素領域における離散的函数方程式について」
2002 - 2003 Study of functional equations by applying value distribution theory and complex dynamics
1999 - 2001 Value distribution of meromorphic functions or holomorphic curves and its applications
1997 - 1998 Studies of The Structures of Analytic Function Spaces and Their Operators
1997 - 1998 「複素微分方程式論の解析的方法と代数的方法の関連について」
1996 - 1996 「複素力学系と複素微分方程式の関連について」
1995 - 1996 Studies of The Spaces of Analytic Functions and Their Operators
1995 - 1995 「複素微分方程式の有理型函数解について」
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Papers (53)：
Heittokangas, J, K. Ishizaki, K. Tohge, Z-T. Wen. Value distribution of exponential polynomials and their role in the theories of complex differential equations and oscillation theory. Bull. London Math. Soc. 2023. 55. 1-77
Heittokangas, J., K. Ishizaki, K. Tohge, Z.-T. Wen. Dual exponential polynomials and a problem of Ozawa. Proc. Royal Soc. Edinb. Sect. A, Math. 2022. 152. 3. 701-719
Ishizaki, K., Zhi-Tao Wen. Difference radical in terms of shifting zero and applications to the Stothers-Mason theorem. Proc. Amer. Math. Soc. 2022. 150. 02. 731-745
Ishizaki, K, R. Korhonen, N. Li, K. Tohge. A Stothers-Mason theorem with a difference radical. Math. Z. 2021. 298. 671-696
Heittokangas, J., K. Ishizaki, I. Laine, K. Tohge. Exponential polynomials in the oscillation theory. J. Differ Equations. 2021. 272. 911-937
Polynomial solutions of some functional equations
(Chinese-Finnish Workshop on Complex Analysis 2019, Suzhou University of Science and Technology 2019)
Value distribution theory and complex difference equations
(The 25th International Conference on Difference Equations and Applications, University College London 2019)
Meromorphic solutions of some algebraic difference equations in the complex plane
(International Conference on Computational Methods and Function Theory 2017, Maria Curie-Sklodowska University, Poland 2017)
Relations between differential equations and functional equations
(Mathematics Research Seminar, University of Eastern Finland, Finland 2015)
On difference equations and value distribution theory
(Workshop on Complex Analysis and its Applications to Differential and Functional Equations, University of Eastern Finland, Finland 2012)
