New ask Hacker News story: Ask HN: Trying to find a specific math book

Ask HN: Trying to find a specific math book
2 by lgdw | 2 comments on Hacker News.
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.

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