Faculty Information - HIRATA Koichi

Faculty Information TOP

E-mail Address

Educational Background

Research Field (Keyword)

Work experience /Academic appointments

Membership of Professional Organizations

Publications

Academic conference presentation

（Last updated : 2025-03-28 18:07:05）

HIRATA Koichi
Department Matsuyama University Department of Informatics, Faculty of Informatics

Position Professor

E-mail Address

Educational Background

1.	1973/04～1978/03	Faculty of Science, Tokyo Institute of Technology, Graduated
2.	1978/04～1980/03	〔Master Course〕, Graduate School, Division of Natural Science, Kyoto University, Completed,
3.	1980/04～1984/03	〔Doctorial Course〕, Graduate School, Division of Natural Science, Kyoto University, Completed,

Research Field (Keyword)

Geometry, Science education (Key Word：wasan, origami, discrete geometry, topolygy, mathematics education, informatics education)

Work experience /Academic appointments

1.	1984/04～1985/03	Ehime University Faculty of Education
2.	1985/04～1989/03	Ehime University Faculty of Education
3.	1989/04～1992/05	Ehime University Faculty of Education
4.	1992/06～2020/03	Ehime University Faculty of Education

Membership of Professional Organizations

1.	2007/04～	The History of Mathematics Society of Japan
2.	2001/04～	Japan Society of Mathematical Education
3.	1979/04～	The Mathematical Society of Japan
4.	2009/04～	Japan Origami Academic Society
5.	2024/12	Information Processing Society of Japan

Publications

1.	2025/02	Article	Casey's Theorem : from the Viewpoint of Inversive Coordinates of Circles Journal of the Japanese Society for the History of Mathematics III-3(2),pp.55-65 (Single)
2.	2024/04	Article	Foundations of Inversive Coordinates of Circles（2） pp.61-126 (Single)
3.	2024/04	Article	Can the Radii of 3 Circles be Changed Arbitrarily using Möbius Transformation? Journal of the Japanese Society for the History of Mathematics III-2(3),pp.169-176 (Single)
4.	2023/10	Article	The Coordinate System Defined by Inversive Distances and Steiner Chains Matsuyama University Review 100th Anniversary Commemorative Edition pp.51-72 (Single)
5.	2023/09	Article	Examples of solving problems by Hirata's arithmetic "Sanpen coordinate method" without using an inversion diagram Wasan Journal pp.30-33 (Collaboration)
6.	2023/08	Article	Foundations of Inversive Coordinates of Circles (1) Matsuyama University Review 35(3),pp.19-72 (Single)
7.	2023/02	Article	Application of the Coordinate System Defined by Inversive Distances to the Wasan Problem "Suginarizan" pp.51-89 (Single)
8.	2022/04	Article	On a Coordinate System Defined by Inversive Distance Matsuyama University Review 34(1),pp.57-103 (Single)
9.	2020/03	Article	Study on Properties of the Sum of Integer Sequence in "Seiyo Sanpo" pp.1-10 (Collaboration)
10.	2006/04	Article	Convex Developments of a Regular Tetrahedron Computational Geometry 34,pp.2-10 (Collaboration)
11.	2005/01	Article	On Convex Developments of a Doubly-Covered Square Combinatorial Geometry and Graph Theory (IJCCGGT 2003), Springer-Verlag LNCS 3330 pp.1-13 (Collaboration)
12.	2005/01	Article	Flat 2-foldings of Convex Polygons Combinatorial Geometry and Graph Theory (IJCCGGT 2003), Springer-Verlag LNCS 3330 pp.14-24 (Collaboration)
13.	2002/09	Article	Spaces of polynomials without 3-fold real root Journal of Mathematics of Kyoto University 42(3),pp.509-516 (Collaboration)
14.	1999/02	Article	Alternate Proofs of Art Gallery Theorems 愛媛大学教育学部紀要第III部自然科学 19(2),pp.17-22 (Collaboration)
15.	1998/09	Article	Characterization of Eight Points in the Plane Containing no Convex Pentagons 愛媛大学教育学部紀要第III部自然科学 19(1),pp.1-4 (Collaboration)
16.	1993/09	Article	Multiplicity of L(k) for the Stable Decomposition of B(Z/p)ⁿ 愛媛大学教育学部紀要第III部自然科学 14,pp.31-34 (Single)
17.	1991/02	Article	On the Multiplicity of Indecomposable Stable Summands for the Classifying Spaces of Elementary Abelian p-Groups 愛媛大学教育学部紀要第III部自然科学 11,pp.1-11 (Single)
18.	1989/02	Article	On the Splitting of K-Cohomology of Lens Space L_n(p^d) 愛媛大学教育学部紀要第III部自然科学 9,pp.1-5 (Single)
19.	1987/02	Article	A Note on the K_{F_q}-Cohomology of Lens Space Lⁿ₀(l^d) 愛媛大学教育学部紀要第III部自然科学 7,pp.1-5 (Single)
20.	1985/02	Article	A Note on the Structure of K-ring of Lens Spaces 愛媛大学教育学部紀要第III部自然科学 5,pp.1-6 (Single)
21.	1984	Article	On the Algebraic K-Cohomology of Lens Spaces Publ. RIMS, Kyoto Univ. 20(5),pp.1083-1089 (Collaboration)
22.	1983	Article	On the Cohomology of Algebraic K-Spectra over Finite Fields Publ. RIMS, Kyoto Univ. 19,pp.743-752 (Single)
23.	1982	Article	On the Bott Cannibalistic Classes Publ. RIMS, Kyoto Univ. 18,pp.1187-1191 (Collaboration)
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Academic conference presentation

2023/09/04

Geometric Foundations of Inversive Coordinates of Circles