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J-GLOBAL ID：201401007757659207
Update date: Jan. 24, 2026
Okumura Hiroshi
オクムラ ヒロシ | Okumura Hiroshi
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Affiliation and department：
旧所属 前橋工科大学 生命情報学科,大学院工学研究科 システム情報工学専攻
About 旧所属 前橋工科大学 生命情報学科,大学院工学研究科 システム情報工学専攻
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Job title：
教授
Homepage URL (1)：
https://www.researchgate.net/profile/Hiroshi-Okumura
Research field (1)：
Geometry
Research keywords (5)：
Division by zero
, Computer discovered mathematics
, origami
, Wasan geometry, sangaku
, arbelos
Papers (187)：
Hiroshi Okumura. Problems involving two circles in a rectangle. Sangaku Journal of Mathematics. 2026. 10. 1-8
Hiroshi Okumura. A Generalization of the Twin Circles of Archimedes. KoG. 2025. 29. 40-43
Hiroshi Okumura. Incorrect sangaku problems involving circles in a rectangle. Sangaku Journal of Mathematics. 2025. 9. 15-23
Hiroshi Okumura. The arbelos in Wasan geometry, Shinohara’s problem. Sangaku Journal of Mathematics. 2025. 9. 5-8
Hiroshi Okumura. The arbelos in Wasan geometry, Nishimura's problem. Sangaku Journal of Mathematics. 2025. 9. 1-4
ｍore...
MISC (49)：
Hiroshi Okumura. Mutually touching three semicircles inscribing in a circle. Shotoh Sugaku. 2023. 95. 36-37
Hiroshi Okumura. Problems 2023-1. Sangaku Journal of Mathematics. 2023. 7. 9-12
Hiroshi Okumura. A sangaku with five problems presenting the relation z^2=4xy: Part 3. Shotoh Sugaku. 2022. 93. 20-23
Hiroshi Okumura. Exposition on the problem 91-1. Shotoh Sugaku. 2021. 92. 95-99
Hiroshi Okumura. A sangaku with five problems presenting the relation z^2=4xy: Part 2. Shotoh Sugaku. 2021. 92. 18-22
ｍore...
Books (6)：
Handbook of the mathematics of the arts and sciences
Springer 2021 ISBN:9783319570716
アルベロス 3つの半円がつくる幾何宇宙
岩波書店 2010
Origami3 : Third International Meeting of Origami Science, Mathematics, and Education sponsored by OrigamiUSA
A.K. Peters 2002 ISBN:1568811810
CD-ROM和算書集成 : 中曽根宗邡コレクション
岩波書店 2001 ISBN:4001301431
情報・システム入門
東京図書 1996
ｍore...
Lectures and oral presentations (1)：
Twin circles in a triangle and its application to an arbelos
(International Conference "Synergetics and reflection in mathematics education", At Bachinovo, Bulgaria 2010)
Professional career (2)：
Ph.D. (Bulgarian Academy of Sciences)
理学修士 (岡山大学)
Awards (1)：
2003 - 日本数学史学会 桑原賞
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