参考文献

チェビシェフ関数, Wikipedia, 閲覧日 2021-08-25, https://ja.wikipedia.org/wiki/%E3%83%81%E3%82%A7%E3%83%93%E3%82%B7%E3%82%A7%E3%83%95%E9%96%A2%E6%95%B0
リーマン予想, Wikipedia, 閲覧日 2021-08-25, https://ja.wikipedia.org/wiki/%E3%83%AA%E3%83%BC%E3%83%9E%E3%83%B3%E4%BA%88%E6%83%B3
Wallis product, Wikipedia, 閲覧日 2021-08-26, https://en.wikipedia.org/wiki/Wallis_product
A. E. Ingham, The Distribution of Prime Numbers, Cambridge University Press, 1990, p.83
H. Vic Dannon, Riemann Zeta Function: The Riemann Hypothesis Origin, the Factorization Error, and the Count of the Primes, 閲覧日 2021-03-07, http://www.gauge-institute.org/riemann/RiemannZetaFunction.pdf
H. M. Edwards, Riemann's Zeta Function, Dover Publications, 1974, pp.90-91
H. M. Edwards, Riemann's Zeta Function, 閲覧日 2021-08-25, http://www.stat.ucla.edu/~ywu/Riemann.pdf