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by akasakahakada 1040 days ago
I don't think there exist any book qualified as "textbook" except this one. Discrete Math by Oscar Levin.

https://discrete.openmathbooks.org/dmoi3/

No left as exercise bullshit, no prove yourself bullshit, etc. Everything is explained thoughtfully and multiple times in the book, to ensure the readers really get the idea of the subject.