For once the Twitter comments are actually good. A gif of the merge sort and another giving its big-O rating.

We changed it from https://twitter.com/fermatslibrary/status/991301499799195648.... The site guidelines ask for original sources (please see https://news.ycombinator.com/newsguidelines.html), and the Twitter thread doesn't contain that much information.

thanks a lot, now I have to dig around to find the twitter link. the paper is boring.