Help us understand the problem. What is going on with this article?

置換の対数を取る

https://scrapbox.io/kuboon/%E7%BD%AE%E6%8F%9B%E3%81%AE%E5%AF%BE%E6%95%B0%E3%82%92%E5%8F%96%E3%82%8B

私とkuboonさんの共同研究です。
私のアイデアを大久保さんがまとめてくれました。
コードはkuboonさんの作です。

fumumue
こんにちは。
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