- 時間と加速度
http://mips.blog.so-net.ne.jp/2010-01-02 If even with those like me, this, it is possible to calculate without even the consciousness that “formality is remembered”,
- 江戸の数学教科書/桜井進/集英社Int'l
http://ameblo.jp/hustler/entry-10270693777.html “Because being possible as for solving this with “infinite series formality” of Euler's, as for him to obtain elegant indication, depended on circumference, that the fact that those which designate the harmony of this series as 6 times are equal to the square of pi of circle of diameter 1 was discovered”, it understands even here that it is the key because circle obtains reply
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オイラー
Euler, Science,
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