Автор Joy of Haskell сделал список алг. структур.
Вместо тысячи причин:
I keep forgetting what the difference is between a ring and a group, which is funny to me because I never forget the difference between a semiring and a semigroup
https://argumatronic.com/posts/2019-06-21-algebra-cheatsheet.html
Post #525
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