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The geometry problems colorfully inscribed on sangaku plaques that survive in shrines and temples throughout Japan have long fascinated those who appreciate the beauty of geometric figures and enjoy challenging puzzles. Aida Yasuaki (1847-1817) was one of the most prolific originators of the wasan tradition that produced them. Instead of presenting and solving problems using modern techniques, Unger presents Aida's own solutions, transcribing his calculations into familiar mathematical notation, highlighting connections between Aida's work and both the mathematics of today and aspects of...

During the period of national isolation, a mathematical tradition called wasan flourished in Japan. Its practitioners produced results comparable to those of mathematicians of the European Enlightment. This companion volume to Unger's earlier translation of solutions by Aida Yasuaki (1747-1817), focuses on problems that he likely used as a teacher.

This book challenges the widespread belief that overzealous Americans forced unnecessary script reforms on an unprepared, unenthusiastic, but helpless Japan during the Occupation. Unger presents neglected historical evidence showing that the reforms implemented from 1946 to 1959 were both necessary and moderate. Although the United States Education Mission of 1946 recommended that the Japanese give serious consideration to the introduction of alphabetic writing, key American officials in the Civil Information and Education Section of GHQ/SCAP delayed and effectively killed action on this...

The geometry problems colorfully inscribed on sangaku plaques that survive in shrines and temples throughout Japan have long fascinated those who appreciate the beauty of geometric figures and enjoy challenging puzzles. Aida Yasuaki (1847-1817) was one of the most prolific originators of the wasan tradition that produced them. Instead of presenting and solving problems using modern techniques, Unger presents Aida's own solutions, transcribing his calculations into familiar mathematical notation, highlighting connections between Aida's work and both the mathematics of today and aspects of...