In case it's not clear, you are (I assume) linking to an explanation of the "common trick" mentioned by stefan_ (https://news.ycombinator.com/item?id=22412340 h

In case it's not clear, you are (I assume) linking to an explanation of the "common trick" mentioned by stefan_ (https://news.ycombinator.com/item?id=22412340 https://news.ycombinator.com/item?id=22412340). Specifically, you are linking to a question that necessitates this trick; one somewhat terse explanation of the trick is the answer https://math.stackexchange.com/a/251566 https://math.stackexchange.com/a/251566 .