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Ask HN: Trying to find a specific math book

There was a book that I think somebody mentioned a while ago in a comment on some post somewhere here but I lost the pdf link to it when I cleared my browser history. It was by a former IOI or IMO winner about several fields of abstract math and their connections. Googling didn't help much so I'm hoping somebody knows the book.
( 5 comments | 4 points | on HN )
Re:Ask HN: Trying to find a specific math book by webmaven on Monday March 28, 2022 @09:54PM (#30837849)
It would help if you specified whether the book is a textbook, if it's a dead tree book or ebook, or if it might even be an online "book" like the Stacks Project: https://stacks.math.columbia.edu/
Re:Ask HN: Trying to find a specific math book by psyklic on Tuesday March 29, 2022 @02:50AM (#30839591)
Perhaps it's "An Infinitely Large Napkin" by Evan Chen? https://web.evanchen.cc/napkin.html
Re:Ask HN: Trying to find a specific math book by lgdw on Tuesday March 29, 2022 @02:56AM (#30839620)
Yes, it's this one! Thank you so much.
Re:Ask HN: Trying to find a specific math book by mx01xz on Monday March 28, 2022 @05:21PM (#30835745)
This might be the thread you're talking about: https://news.ycombinator.com/item?id=30822339
Re:Ask HN: Trying to find a specific math book by lgdw on Monday March 28, 2022 @05:29PM (#30835838)
Very interesting but I think the original thread was at least a month ago.