Sugawa Laboratory

Sugawa Laboratory

Events

Monthly:Tohoku Complex Analysis Seminar (Japanese)
2024.08:30th International Conference on Finite or Infinite Dimensional Complex Analysis and Applications (ICFIDCAA 2024)
2020.02:Workshop on Geometric Function Theory and Special Functions III
2019.02:Geometric Function Theory and Related Topics
2018.09:International Workshop on Conformal Dynamics and Loewner Theory
2018.02:Workshop on Quasiconformal Mappings and Related Topics
2017.08:Workshop on Geometric Function Theory and Special Functions II
2016.08:Workshop on Geometric Function Theory and Special Functions
2015.04:The 3rd GSIS-RCPAM International Symposium
2014.11:57th Symposium on Function Theory (Japanese)
2013.09.: The 2nd GSIS-RCPAM International Symposium

Lectures and Seminars


Mon Tue Wed Thu Fri
1
8:50-
      Lecture Lecture
2
10:30-
  Personal Seminar
(Mino)
Personal Seminar
(Komitau)
Personal Seminar
(Yamazaki)
Personal Seminar
(Momoi)
3
13:30-
Monday Seminar (13:00-)
(Plenary)
Online
Personal Seminar
(Sampson)
M2 Seminar
(Ichikawa/Itabashi)
Personal Seminar
(Inaba)
Personal Seminar
(Alsharari)
4
15:00-
Personal Seminar
(Asaka/Sakuta)
Personal Seminar
(Wu)
Personal Seminar
(Chen)
TCAS (Monthly)
(15:00-)
 

All the seminars are being held in room 609 on 6F of the GSIS building.
Details might change for some reasons.

Monday Seminar


Next Monday Seminar

Meeting Time:2026/06/22 14:30 - 15:30
Speaker & Title: Akira Mino --- Angular and Unrestricted Limits of One-Parameter Semigroups in the Unit Disk

Previous Monday Seminar

Meeting Time:2026/06/15 13:00 - 14:00
Speaker & Title: De-An Chen --- Differential Inequalities for Spirallike and Strongly Starlike Functions

Meeting Time:2026/06/15 14:10 - 15:10
Speaker & Title: Keita Yamazaki --- On Length Distortions with Respect to Quadratic Differential Metrics

Meeting Time:2026/06/08 13:00 - 14:00
Speaker & Title: Xiaobin Wu --- On Quasisymmetric Homeomorphisms

Meeting Time:2026/06/08 14:10 - 15:10
Speaker & Title: Pierre Komitau --- Discrete Riemann Surfaces

Meeting Time:2026/06/01 13:00 - 14:00
Speaker & Title: Pierre Komitau --- Amoebas, Monge--Ampère Measures, and Triangulations of the Newton Polytope

Meeting Time:2026/06/01 14:10 - 15:10
Speaker & Title: Zain Alsharari --- On the Coefficients of $\alpha$-Logarithmically Convex Functions

Meeting Time:2026/05/25 13:00 - 14:00
Speaker & Title: Makoto Inaba --- Schwarz Lemma for the Solutions to the Dirichlet Problems for the Invariant Laplacians

Meeting Time:2026/05/25 14:10 - 15:10
Speaker & Title: Akira Mino --- One-Parameter Semigroups of Analytic Functions, Fixed Points and the Koenigs Function

Meeting Time:2026/05/18 13:00 - 14:00
Speaker & Title: Keita Yamazaki --- Transitivity on Weierstrass Points

Meeting Time:2026/05/18 14:10 - 15:10
Speaker & Title: Xiaobin Wu --- On Trivial and Locally Trivial Beltrami Differentials

Meeting Time:2026/05/11 13:00 - 14:00
Speaker & Title: De-An Chen --- Starlikeness Criteria for a Certain Class of Analytic Functions

Meeting Time:2026/05/11 14:10 - 15:10
Speaker & Title: Xiaobin Wu --- Strongly Symmetric Homoemorphisms on the Real Line with Uniform Continuity

Meeting Time:2026/04/20 13:00 - 14:00
Speaker & Title: Pierre Komitau --- Real Riemann Surfaces: Smooth and Discrete

Meeting Time:2026/04/20 14:10 - 15:10
Speaker & Title: Zain Alsharari --- Inequalities for the Coefficients of Schwarz Functions

Meeting Time:2026/04/13 13:00 - 14:00
Speaker & Title: Akira Mino --- Nonlinear Resolvents in the Unit Disk: Geometry and Dynamics

Meeting Time:2026/04/13 14:10 - 15:10
Speaker & Title: Xiaobin Wu --- Strongly Symmetric Homeomorphisms on the Real Line with Uniform Continuity

Meeting Time:2026/01/26 13:30 - 14:30
Speaker & Title: Zain Alsharari --- Harmonic Measure of Arcs of Fixed Length

Meeting Time:2026/01/26 14:40 - 15:40
Speaker & Title: Akira Mino --- Semigroups-Fication of Univalent Self-Maps of the Unit Disc

Meeting Time:2026/01/19 13:30 - 14:30
Speaker & Title: Keita Yamazaki --- Systoles and Diameters of Hyperbolic Surfaces

Meeting Time:2026/01/19 14:40 - 15:40
Speaker & Title: Xiaobin Wu --- Norm Estimation for Pre-Schwarizian and Schwarzian Derivatives of Some Univalent Functions

Meeting Time:2026/01/05 13:30 - 14:30
Speaker & Title: Zain Alsharari --- Weighted Bergmn Spaces and the Integral Means Spectrum of Conformal Mappings

Meeting Time:2026/01/05 14:40 - 15:40
Speaker & Title: De-An Chen --- Sufficient Conditions for the Univalence and Quasiconformal Extensions of Meromorphic Functions

Meeting Time:2025/12/15 13:30 - 14:30
Speaker & Title: Akira Mino --- Non-linear Resolvents of Holomorphically Accretive Mappings

Meeting Time:2025/12/15 14:40 - 15:40
Speaker & Title: Pierre Komitau --- Discrete Complex Analysis and Probability

Meeting Time:2025/12/08 13:30 - 14:30
Speaker & Title: Keita Yamazaki --- Quotients of Hyperbolic Metrics

Meeting Time:2025/12/01 13:30 - 14:30
Speaker & Title: Zain Alsharari --- Harmonic Measure on Fractal Sets

Meeting Time:2025/12/01 14:40 - 15:40
Speaker & Title: De-An Chen --- On Aanalytic Families of Conformal Maps

Meeting Time:2025/11/17 13:30 - 14:30
Speaker & Title: Pierre Komitau --- The Laplacian and Dirac Operators on Critical Planar Graphs

Meeting Time:2025/11/17 14:40 - 15:40
Speaker & Title: Akira Mino --- Infinitesimal Generators of Semigroups with Prescribed Boundary Fixed Points

Meeting Time:2025/11/10 13:30 - 14:30
Speaker & Title: Keita Yamazaki --- A Tale of Two Conformally invariant Metrics

Meeting Time:2025/11/10 14:40 - 15:40
Speaker & Title: Xiaobin Wu --- Strongly Symmetric Homeomorphisms on the Real Line with Uniform Continuity

Meeting Time:2025/10/27 13:30 - 14:30
Speaker & Title: De-An Chen --- Univalence Criteria Depending on Parameters

Meeting Time:2025/10/20 13:30 - 14:30
Speaker & Title: Akira Mino --- SOME REMARKS ON THE ABEL EQUATION IN THE UNIT DISK

Meeting Time:2025/10/06 13:30 - 14:30
Speaker & Title: Zain Alsharari --- On Littlewood's Constants

Meeting Time:2025/10/06 14:40 - 15:40
Speaker & Title: Pierre Komitau --- Discrete Complex Analysis on Planar Quad-Graphs

Meeting Time:2025/07/28 13:30 - 14:30
Speaker & Title: Yuji Sakai --- An analytical investigation on starlikeness and convexity properties for hypergeometric functions

Meeting Time:2025/07/28 14:40 - 15:40
Speaker & Title: Keita Yamazaki --- On the minimal distance between elliptic fixed points for geometrically finite Fuchsian groups

Meeting Time:2025/07/14 13:30 - 14:30
Speaker & Title: Akira Mino --- On application of differential subordination for Carathéodory functions

Meeting Time:2025/07/14 14:40 - 15:40
Speaker & Title: De-An Chen --- On Becker's univalence criterion

Meeting Time:2025/07/07 13:30 - 14:30
Speaker & Title: Yuji Sakai --- Mapping properties of the zero-balanced hypergeometric functions

Meeting Time:2025/07/07 14:40 - 15:40
Speaker & Title: Keita Yamazaki --- Comparing Invariant Distances and Conformal Metrics on Riemann Surfaces

Meeting Time:2025/06/16 13:45 - 14:45
Speaker & Title: Akira Mino --- A certain subclass of analytic functions defined by means of differential subordination

Meeting Time:2025/06/16 14:55 - 15:55
Speaker & Title: Zain Alsharari --- Growth Theorems for a Subclass of Strongly Spirallike Functions

Meeting Time:2025/06/09 13:30 - 14:30
Speaker & Title: Yuji Sakai --- Starlikeness of the Gaussian hypergeometric functions

Meeting Time:2025/06/09 14:40 - 15:40
Speaker & Title: Zain Alsharari --- Correspondence between spirallike functions and starlike functions

Meeting Time:2025/06/02 14:40 - 15:40
Speaker & Title: De-An Chen --- Nehari's univalence criteria, pre-Schwartzian derivative and applications

Meeting Time:2025/05/26 13:30 - 14:30
Speaker & Title: Keita Yamazaki --- An estimate for the hyperbolic length of closed geodesics on Riemann surfaces

Meeting Time:2025/05/26 14:40 - 15:40
Speaker & Title: Pierre Komitau --- Functions on discrete sets holomorphic in the sense of Ferrand, or monodiffric functions of the second kind

Meeting Time:2025/05/19 13:30 - 14:30
Speaker & Title: Akira Mino --- Loewner chains and univalence criteria related with Ruscheweyh and Salagean derivatives

Meeting Time:2025/05/19 14:40 - 15:40
Speaker & Title: Zain Alsharari --- Univalent Functions with Quasiconformal Extensions: Becker's Class and Estimates of the Third Coefficient

Meeting Time:2025/05/12 13:30 - 14:30
Speaker & Title: Yuji Sakai --- A study of two new integral representations for Gauss's hypergeometric function with applications

Meeting Time:2025/04/28 14:40 - 15:40
Speaker & Title: Keita Yamazaki --- Diameter of Compact Riemann Surfaces

Meeting Time:2025/04/28 15:50 - 16:50
Speaker & Title: De-An Chen --- An extension of the univalence criteria of Nehari and Ozaki and Nunokawa

Meeting Time:2025/04/21 13:30 - 14:30
Speaker & Title: Pierre Komitau --- Computing quasiconformal maps using an auxiliary metric and discrete curvature flow

Meeting Time:2025/04/21 14:40 - 15:40
Speaker & Title: Akira Mino --- On the generalized Zalcman conjecture

Meeting Time:2025/04/21 13:30 - 14:30
Speaker & Title: Pierre Komitau --- Computing quasiconformal maps using an auxiliary metric and discrete curvature flow

Meeting Time:2025/04/21 14:40 - 15:40
Speaker & Title: Akira Mino --- On the generalized Zalcman conjecture

Meeting Time:2025/04/14 13:30 - 14:30
Speaker & Title: Yuji Sakai --- Two Supercongruences Involving Truncated Hypergeometric Series

Meeting Time:2025/04/14 14:30 - 15:30
Speaker & Title: Zain Alsharari --- Moduli difference of inverse logarithmic coefficients of univalent functions

Meeting Time:2024/12/16 13:30 - 14:30
Speaker & Title: Takeru Asaka --- The anti de Sitter proof of Thurston's earthquake theorem

Meeting Time:2024/12/16 14:30 - 15:30
Speaker & Title: Yuji Sakai --- On the Absolute Monotonicity of the Logarithmic of Gaussian Hypergeometric Function

Meeting Time:2024/11/25 13:30 - 14:30
Speaker & Title: Gangqiang Chen --- Schwarzian norm estimate for functions in Robertson class

Meeting Time:2024/11/18/ 13:30 - 14:30
Speaker & Title: Zain --- Starlike functions associated with the generalized Koebe function

Meeting Time:2024/07/29 13:30 - 14:30
Speaker & Title: Yuji Sakai --- Hyers-Ulam stability of hypergeometric differential equations

Meeting Time:2024/07/22 13:30 - 14:30
Speaker & Title: Xiaoyuan Wang --- Criteria for Bounded Valence of Harmonic Mappings

Meeting Time:2024/07/22 14:30 - 15:30
Speaker & Title: Chen Gangqiang --- A new Schwarz-Pick lemma at the boundary and rigidity of holomorphic maps

Meeting Time:2024/07/08 13:30 - 14:30
Speaker & Title: Zain --- Logarithmic Coefficient Bounds and Coefficient Conjectures for Classes Associated with Convex Functions

Meeting Time:2024/06/24 13:30 - 14:30
Speaker & Title: Chen Gangqaing --- Survey on filtrations (parametric embeddings) of infinitesimal generators

Meeting Time:2024/06/24 14:30 - 15:30
Speaker & Title: Yuji Sakai --- Solutions of Hypergeometric ODE with b Equal to c for Any x

Meeting Time:2024/06/17 14:30 - 15:30
Speaker & Title: Xiaoyuan Wang --- On De la Vallée Poussinmeans for harmonicmappings

Meeting Time:2024/06/10 13:30 - 14:30
Speaker & Title: Zain Alsharari --- Two applications of Grunsky coefficients in the theory of univalent functions

Meeting Time:2024/06/10 14:30 - 15:30
Speaker & Title: CHEN Gangqiang --- The Sharp Distortion Estimate Concerning Julia’s Lemma

Meeting Time:2024/06/03 13:30 - 14:30
Speaker & Title: Xiaoyuan Wang --- Properties of Logharmonic Mappings

Meeting Time:2024/06/03 14:30 - 15:30
Speaker & Title: Takeru Asaka --- Solving Olympiad Geometry without Human Demonstrations

Meeting Time:2024/05/27 13:30 - 14:30
Speaker & Title: Xiaoyuan Wang --- Univalent harmonic mappings and Hardy spaces has been attached

Meeting Time:2024/05/27 14:30 - 15:30
Speaker & Title: Chen Gangqiang --- Some Bohr-type inequalities with one parameter for bounded analytic functions

Meeting Time:2024/05/20 13:30 - 14:30
Speaker & Title: Chen Gangqiang --- Successive coefficients for functions in the spirallike family

Meeting Time:2024/05/20 14:30 - 15:30
Speaker & Title: Alsharari Zain --- On the Difference of Coefficients of Univalent Functions

Meeting Time:2024/05/13 14:30 - 15:30
Speaker & Title: Alsharari Zain --- On the Difference of Coefficients of Univalent Functions

Meeting Time:2024/04/22 13:30 - 14:30
Speaker & Title: Yuji Sakai --- An Algorithm for Solving Linear Ordinary Differential Equations of Fuchsian Type with Three Singular Points

Meeting Time:2024/04/22 14:30 - 15:30
Speaker & Title: Xiaoyuan Wang --- Univalent harmonic mappings and Hardy spaces

Meeting Time:2024/04/15 13:30 - 14:30
Speaker & Title: Xiaoyuan Wang --- Koebe Type Theorems and Pre-Schwarzian of Harmonic K-quasiconformal Mappings

Meeting Time:2024/04/15 14:30 - 15:30
Speaker & Title: Chen Gangqiang --- Ahamed, M.B., Ahammed, S. Bohr Type Inequalities for the Class of Self-Analytic Maps on the Unit Disk. Comput. Methods Funct. Theory 23, 789–806 (2023).

Meeting Time:2022/1/31 13:30 - 14:30
Meeting ID:302 070 324
Meeting Link:https://voovmeeting.com/dm/gkAee2gW5EB7
Speaker & Title: Dr. Md. Shafiul Alam --- Schlafli modular equations for generalized Weber functions
Shun Kumagai --- Computing Periodic Points on Veech Surfaces

Meeting Time:2022/1/24 13:30 - 14:30
Speaker & Title: Dr. Md. Shafiul Alam --- Schlafli modular equations for generalized Weber functions
Shun Kumagai --- Automorphism groups of dessins d'enfants

Meeting Time:2022/1/17 13:30 - 14:30
Speaker & Title: Xiushuang Ma --- Integral transforms for logharmonic mappings
Shun Kumagai --- Automorphism groups of dessins d'enfants

Meeting Time:2021/12/20 13:30 - 15:40
Speaker & Title: Md. Shafiul Alam --- Modular equations for congruence subgroups of genus zero (II)
Shun Kumagai --- Automorphism groups of dessins d'enfants

Meeting Time:2021/12/13 13:30 - 14:30
Speaker & Title: Gangqiang Chen --- The Bohr-type operator on analytic functions and sections
Xiushuang Ma --- Convolutions of normalized harmonic mappings

Meeting Time:2021/12/06 13:30 - 15:40
Speaker & Title: Md. Shafiul Alam --- Modular equations of a continued fraction of order six
Xiushuang Ma --- Convolutions of normalized harmonic mappings

Meeting Time:2021/11/29 13:30 - 15:40
Speaker & Title: Shun Kumagai --- Systoles in translation surfaces
Gangqiang Chen --- An Application of the Schur Algorithm to Variability_Regions of Certain Analytic Functions-I

Meeting TIme:2021/11/22 13:30 - 15:40
Speaker & Title: Md. Shafiul Alam --- A continued fraction of order twelve as a modular function
Xiushuang Ma --- A convolution property of univalent harmonic right half-plane mappings

Meeting Time:2021/11/15 13:30 - 15:40
Speaker & Title: Shun Kumagai --- General origamis and Veech groups of flat surfaces
Lijie Sun --- C-Fuchsian subgroup in some non-arithmetic lattices

Meeting Time:2021/11/08 13:30 - 15:40
Speaker & Title: Md. Shafiul Alam --- Aspects of Hecke Symmetry: Anomalies, Curves, and Chazy Equations
Xiushuang Ma --- John Disks and K-Quasiconformal Harmonic Mappings

Meeting Time:2021/10/25 13:30 - 15:40
Speaker & Title: Shun Kumagai --- Finite translation surfaces with maximal number of translations
Xiushuang Ma --- Lipschitz spaces and harmonic mappings

Meeting Time:2021/10/18 13:30 - 15:40
Speaker & Title: Md. Shafiul Alam --- Geodesic Rosen continued fractions
Xiushuang Ma --- Concave conformal mappings and pre-vertices of Schwarz-Christoffel mappings

Meeting Time:2021/10/11 13:30 - 15:40
Speaker & Title: Shun Kumagai --- A comb of origami curves in the moduli space M3 with three-dimensional closure
Xiushuang Ma --- Bohr Radius for Subordination and K-quasiconformal Harmonic Mappings

Meeting Time:2021/10/04 13:30 - 15:40
Speaker & Title: Md. Shafiul Alam --- A sharp double inequality involving generalized complete elliptic integral of the first kind
Xiushuang Ma --- Angular derivatives of quasiconformal harmonic maps on the Poincaré disk

Meeting Time:2021/07/26 14:40 - 15:40
Speaker & Title: Shun Kumagai --- Non-planarity of SL(2, Z)-orbits of origamis in H(2)
Md. Shafiul Alam --- Uniformization of punctured spheres and modular forms

Meeting Time:2021/07/19 13:30 - 15:40
Speaker & Title: Xiushuang Ma --- QUASICONFORMAL EXTENSION OF MEROMORPHIC FUNCTIONS WITH NONZERO POLE
Md. Shafiul Alam --- Uniformization of punctured spheres and modular forms

Meeting Time:2021/07/12 13:30 - 15:40
Speaker & Title: Shun Kumagai --- Calculation of Grothendieck dessin of genus 1
Md. Shafiul Alam --- STRUCTURAL PROPERTIES OF QUOTIENT SURFACES OF A HECKE GROUP

Meeting Time:2021/06/28 14:40 - 15:40
Speaker & Title: Shun Kumagai --- Zapponi-orientable dessins d’enfants
Xiushuang Ma --- Univalency of convolutions of harmonic mappings

Meeting Time:2021/06/14 13:30 - 15:40
Speaker & Title:Shun Kumagai --- Zapponi-orientable dessins d’enfants
Xiushuang Ma --- Convolution of Harmonic Mappings On The Exterior Unit Disk and the Generalized Hypergeometric Functions

Meeting Time:2021/06/07 13:30 - 15:40
Speaker & Title:Md. Shafiul Alam --- GEODESIC COVER OF FUCHSIAN GROUPS
Xiushuang Ma --- Radius of close-to-convexity and fully starlikeness of harmonic mappings

Meeting Time:2021/01/18 13:30 - 15:40
Speaker & Title:Md. Shafiul Alam --- Arithmetic and geometry of the Hecke groups
Shun Kumagai --- Infinite translation surfaces with infinitely generated veech groups

Meeting Time:2020/12/28 13:30 - 15:40
Speaker & Title:Dr. Limei Wang --- The squeezing function on doubly-connected domains via the Loewner differential equation
Dr. Chen Gangqiang --- ON THE BOHR INEQUALITY WITH A FIXED ZERO COEFFICIENT

Meeting Time:2020/12/21 13:30 - 15:40
Speaker & Title:Md. Shafiul Alam --- CONJUGACY CLASSES OF EXTENDED GENERALIZED HECKE GROUPS
Xiushuang Ma --- Coefficient Estimates and Landau-Bloch's Constant for Planar Harmonic Mappings

Meeting Time:2020/12/07 13:30 - 15:40
Speaker & Title: Dr. Chen Gangqiang --- A GENERALIZED HURWITZ METRIC
Shun Kumagai --- Arithmetic Veech sublattices of SL(2,Z)

Meeting Time:2020/11/30 13:30 - 15:40
Speaker & Title: Md. Shafiul Alam --- Normal Subgroups of Hecke Groups H(λ)
Xiushuang Ma --- Univalency of Convolutions of Univalent Harmonic Right Half-Plane Mappings

Meeting Time:2020/11/16 13:30 - 15:40
Speaker & Title: Md. Shafiul Alam --- CONVEX STANDARD FUNDAMENTAL DOMAIN FOR SUBGROUPS OF HECKE GROUPS
Shun Kumagai --- Periodic points on the regular and double n-gon surfaces

Meeting Time:2020/11/02 13:30 - 15:40
Speaker & Title: Md. Shafiul Alam --- TRANSCENDENCE OF ZEROS OF AUTOMORPHIC FORMS FOR CUSPIDAL TRIANGLE GROUPS
Xiushuang Ma --- CLOSE-TO-CONVEXITY CRITERIA FOR PLANAR HARMONIC MAPPINGS

Meeting Time:2020/10/26 13:30 - 15:40
Speaker & Title: Shun Kumagai --- ORIGAMI EDGE-PATHS IN THE CURVE GRAPH
Prof. Toshiyuki Sugawa --- ON THE ORDER OF CONVEXITY FOR THE SHIFTED HYPERGEOMETRIC FUNCTIONS

Meeting Time:2020/10/19 13:30 - 15:40
Speaker & Title: Md. Shafiul Alam --- EXPLICIT EQUATIONS OF SOME ELLIPTIC MODULAR SURFACES
Xiushuang Ma --- BLOCH CONSTANTS FOR PLANAR HARMONIC MAPPINGS

Meeting Time:2020/10/12 13:30 - 15:40
Speaker & Title: Dr. Ming Li --- Convolutions of Harmonic Right Half-Plane Mappings with Harmonic Strip Mappings
Shun Kumagai --- THE DEFICIENCY OF BEING A CONGRUENCE GROUP FOR VEECH GROUPS OF ORIGAMIS

Meeting Time:2020/10/05 13:30 - 15:40
Speaker & Title: Md. Shafiul Alam --- Modular curves and bases for the spaces of cuspidal modular forms
Xiushuang Ma --- Certain multipliers of univalent harmonic functions