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On July 17, 2014, Seiichi Koshiba and Masami Yamane said at Gunma University:
The idea for the division of Hiroshi Michiwaki and Eko Michiwaki (6 years old daughter) is that division and product are different concepts and they were calculated independently for long old years, by repeated addition and subtraction, respectively.
Mathematicians made the serious mistake for very long years that the division by zero is impossible by considering that division is the inverse operation of product. The division by zero was, however, clear and trivial, as z/0=0, from the own nature of division.
2015.1.20.06:40 数日前から考えが湧いていた。
2015.1.20.07:15
2015.1.20.15:35 玄関の修理、天井。
2015.1.20.20:20
2015.1.21.06:47
2015.1.23.06:47
2015.1.27.09:30 英文修正