Sangaku Journal of Mathematics
Published by the VUZF University of Finance, Business and Entrepreneurship, Sofia, Bulgaria
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ISSN 2534-9562

Editors-in Chief:
Hiroshi Okumura, Professor, Ph.D.
Maebashi Gunma, 371-0123, Japan
e-mail: hokmr@yandex.com
Sava Grozdev, Professor, DSc,
VUZF University of Finance, Business and Entrepreneurship, Sofia, Bulgaria
e-mail: sava.grozdev@gmail.com


Volume 2 (2018)

Giovanni Lucca, A Note on a Pappus Sangaku Problem and a Family of Integer Sequences, pp.1-2.
Hiroshi Okumura, A note on a problem involving a square in a curvilinear triangle, pp.3-5.
Problems 2018-1, p.6.
Problems 2018-2, p.7.
Hiroshi Okumura, A note on an isosceles triangle containing a square and three congruent circles, pp.8-10.
Abdilkadir Altintas and Hiroshi Okumura, A note on Pappus chain and a collinear theorem, pp. 11-12.
Viera Čerňanová, Solution to 2018-1 Problem 2, pp.13-14.
Viera Čerňanová, Solution to 2018-1 Problem 1, pp.15-16.
Hiroshi Okumura, Solution to 2017-3 Problem 5, pp.17-21.
Jana Fialová, Solution to 2018-2 Problem 1, pp.22-23.
Hiroshi Okumura, Solution to the problem proposed in "Solution to 2017-3 Problem 5", pp.24-26.
Hiroshi Okumura, Solution to 2017-1 Problem 4 with division by zero, pp.27-30.
Giovanni Lucca, Integer Sequences and Circle Chains Inside a Tangential Quadrilateral, pp.31-40.
Problems 2018-3, pp.41-42.
Hiroshi Kinoshita, An Unsolved Problem in the Yamaguchi's Travell Diary, pp.43-53.
The paper is reprinted from "Shotoh Sugaku", Volume 70 (2012) pp. 32-36 with permission from the publisher along with a supplementary Appendix.
Hiroshi Okumura, Solution to Problem 2018-3-2, pp.54-56.
Hiroshi Okumura and Saburou Saitoh, Wasan Geometry and Division by Zero Calculus, pp.57-73.
Li Ting Hon Stanford, Solution to 2017-3 Problem 3, pp.74-75.


Volume 1 (2017)

Hiroshi Okumura, Japanese mathematics, pp.1-6.
The paper is reprinted from "Symmetry: Culture and Science",Volume 12 (1-2) 79-86 (2001) with permission from the publisher.
Problems 2017-1, pp.7-10.
Problems 2017-2, pp.11-12.
Francisco Javier García Capitán, Solution to 2017-1 Problem 1, pp.13-15.
Yasuo Kanai and Hiroshi Okumura, A three tangent congruent circle problem, pp.16-20.
Supplementary material: animation.gif
Problems 2017-3, pp.21-23.
Hiroshi Okumura, Configurations of congruent circles on a line, pp.24-34.
Hiroshi Okumura, Theorems on two congruent circles on a line, pp.35-38.
Hiroshi Okumura, A note on the problems involving congruent circles in Tenzan Kaitei, pp.39-41.
Hiroshi Okumura, Haga's theorems in paper folding and related theorems in Wasan geometry Part 1, pp.42-56.