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Publikováno v:
Journal for History of Mathematics. 27:111-125
Jisuguimundo is an inimitable magic hexagon devised by CHOI Seok-Jeong, who was the author of GuSuRyak as well as a prime minister in Joseon dynasty. Jisuguimundo, recorded in GuSuRyak, is also known as Hexagonal Tortoise Problem (HTP) because its ni