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I am more surpised that the other amateur mathematian appearing in this article is Greg Egan (He has a personal website on https://www.gregegan.net/).

He is one of the best contemporary hard SF writers in the world.

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He also must be one of the best recreational mathematicians in the world, as anyone who follows his work on his website and Mastodon knows.

sometimes on HN, I cannot tell which posts are AstroTurfing because the praise often is so niche and unrelated and superlative

Sometimes it's alright. I got motivated to dig and found a list of Greg Egan's non-fiction books:

https://www.gregegan.net/BIBLIOGRAPHY/Bibliography.html#NonF...

Waiting for the series Winning Ways for Your Mathematical Plays (various authors) gets a little cheaper.

>best recreational mathematicians in the world

What does that involve? does that mean he's good at math or is he coming up with new research and theorems and such?

He has coauthored math/physics papers with John Baez and Dan Christensen off the top of my head, I'm sure there are others.

Wow. Any recommendation where to start?

All of them but I personally love Permutation City.

Apropos to today's topic

thank you

Schild's Ladder is my personal favourite.

thank you

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