Thanks to @TheRevAlokSingh for sharing this excellent textbook. Marvellously concise, builds up a *lot* in just 80 pages. Link:

@PatrickKidger That is a special case of "-".join(authors) theorem

@PatrickKidger quite radically elementary if you ask me.

@PatrickKidger Wow, even 18th century mathematicians had an Erdos number of 1. Impressive

@PatrickKidger Reminds me of Stokes’ theorem…

@PatrickKidger 🙈

@PatrickKidger Teamwork? 🤣

@PatrickKidger Reading up on nonstandard analysis?

@PatrickKidger Same reaction when I saw it