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Researcher Information

last modified:2017/05/23

Professor KASUE Atsushi


Faculty, Affiliation

Faculty of Mathematics and Physics, Institute of Science and Engineering

College and School Educational Field

Division of Mathematical and Physical Science, Graduate School of Natural Science and Technology
School of Mathematics and Physics, College of Science and Engineering


Department of Mathematics TEL:076-264-5643 FAX:076-264-5738

Academic Background

【Academic background(Doctoral/Master's Degree)】
Osaka University Master 1980
【Academic background(Bachelor's Degree)】
Osaka University 1978


Year & Month of Birth


Academic Society



Laplace operator Spectral convergence、differential geometry

Speciality Keywords

Riemannian manifold, network, energy form, Laplace operator, potential theory

Research Themes

Compactifications of Riemannian manifolds and embeddings of graphs

We study p-harmonic functions of finite p-Dirichlet sum
on networks in Hadamard manifolds in relation to their
geometric compactifications and embeddings of finite
graphs into the maifolds.

Dirichlet finite maps and asymptotic geometry of infinite graphs

We investigate the spaces of functions of finite Dirichlet sums in indinite graphs or
infinite networks in relation to geometric structure of graphs or networks,via quasimono-morphisms or Dirichlet finite maps. Our study is focuced on behavior of such maps near Royden boundary, Kuramochi boundary, Floyd boundary, and Gromov hyperbolic boun-
dary of graphs or networks. It is important to treat with general exponents other than 2
in Dirichlet finite functions or maps.

Convergence theory of metric measure spaces

I study sets of finite networks (weighted graphs). By using effective resistance (combined resistance), Hausdorff convergence in the sense of Gromov and variation convergence based on energy form can be defined. A variety of things appear in the diagrams (spaces) that emerge in the limit of the sets based in these phases, including so-called fractal sets and infinite networks. The present research analyzes the Markov-type family that appears in the limit and Kuramochi compactization associated with each, primarily focusing on infinite networks (reversible Markov chains).

Random walks and Dirichlet finite maps

I study the relationship between random walk on an infinite network, and Dirichlet energy finite function. More generally, I research Dirichlet energy finite mapping onto complete metric space. Dirichlet energy finite mapping, when followed along random walk, approaches a finite definite value. I investigate the relationship between this fact and the space called Kuramochi compactization of infinite network.


  •  Riemmannian manifolds and their limits Mathematical Society of Japan 2004/08


  •  Random walks and Kuramochi boundaries of infinite networks OSAKA JOURNAL OF MATHEMATICS 50 1 31-51 2013/03
  •  Functions with finite Dirichlet sum of order p and quasi-monomorphisms of infinite graphs  Tae Hattori NAGOYA MATHEMATICAL JOURNAL 207 95-138 2012/08
  •  Covergence of metric graphs and energy forms 26 2 367-448 2010/04
  •  Convergence of Riemannian manifolds and Laplace operators, II POTENTIAL ANALYSIS 24 137-194 2006/01
  •  Variational Convergence of Finite Networks 12 1 57-70 2006

show all

  •  A Thmson's principle and a Rayleigh's monotonicity law for nonlinear networks Atsushi Kasue Potential Analysis 2016/06/06
  •  Dirichlet finite harmonic functions and points at infinity of graphs and manifolds, Tae Hattori PROCEEDINGS OF THE JAPAN ACADEMY SERIES A-MATHEMATICAL SCIENCES 83 129-134 2007
  •  EXPANSION CONSTANTS AND HYPERBOLIC EMBEDDINGS OF FINITE GRAPHS Hattori, Tae; Kasue, Atsushi Mathematika 2014/11/19 

Conference Presentations

Arts and Fieldwork


Theme to the desired joint research

Grant-in-Aid for Scientific Research


Classes (Bachelors)

○Mathematical Thinking(2017)
○Analysis 2C(2017)
○Advanced Calculus 2A(2017)
○Advanced Calculus 2B(2017)
○Geometry 2B(2017)
○Geometry 2A(2017)
○Mathematical Thinking(2017)
○Geometry 2A(2016)
○Geometry 2B(2016)
○Introduction to Current Mathematics(2016)
○Differential and Integral Calculus 1(2016)
○Mathematical Thinking(2016)

Classes (Graduate Schools)

○Exercise A(2017)
○Seminar A(2017)
○Research Work A(2017)
○Geometric Analysis(2017)
○Seminar A(2016)
○Mathematics Education b(2016)
○Exercise A(2016)
○Research Work A(2016)
○Mathematics Education a(2016)
○Geometric Analysis(2016)

International Project

International Students

Lecture themes

○Lines, circles and elementary geometry

Others (Social Activities)

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