Mathematics (日本語) \( \varphi(n) = \sum_{d|n} \mu(d) \frac{n}{d} \) Wednesday April 6th, 2016 Kenji Sorry, this entry is only available in 日本語.
Mathematics (日本語) 約数についてのオイラー関数の総和は元の数になる Wednesday April 6th, 2016 Kenji Sorry, this entry is only available in 日本語.