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by dmr_92 1478 days ago
Bit of a brain dump here. Serre's Trees was pretty relevant to my studies, though left quite a few gaps for the reader to fill in.

Meier's Groups, Graphs and Trees is much more accessible and visual. Strongly recommended!

Knuth's notes on how to write mathematics well [1] were very influential.

Munkres' Topology is a classic, but I think I leaned more on Hatcher's Algebraic Topology towards the end.

Drobot's Formal Languages and Automata Theory was a lot of fun to self-study.

The Graduate Texts in Mathematics series was always reliable in my experience.

[1]: https://www-cs-faculty.stanford.edu/~knuth/klr.html