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Also, suggest other seminal textbooks.
never heard of this one but I'm a combo guy.
Concrete Math is reeeeeeeeeally good. Pretty much the classic discrete math book for mathematicians.
Generatingfunctionology is a cool next book to read. If you're into graph theory get anything by Bollobas.
If you want to study some "offbeat" combinatorics, check out Combinatorial Designs by Stinson. Best introduction to that field that I've seen.
It's kind of a funny title. But you know how most discrete math books are very low level and don't have much theory because they are for freshman CS majors who don't like math, and how CS students who study from those wind up not even being able to write a proof by induction by the time they're a junior?
Concrete math is the exact opposite of that. It actually gives you a theoretical foundation in the mathematics that will be useful in CS, or later on in pure math if you're a combinatorialist.