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: okmr@protonmail.com
Sava Grozdev, Professor, DSc,
VUZF University of Finance, Business and Entrepreneurship, Sofia, Bulgaria
e-mail: sava.grozdev@gmail.com


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.