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I remember using Mathematical Thinking [0] for Concepts of Mathematics (21-128) which is also a great book!

[0] https://www.goodreads.com/book/show/445059.Mathematical_Thin...

If we're dropping links, here's the one [0] from my undergrad discrete math course that seems to have a lot of overlap with the topics in the CMU book. Our professor called it "notes" but it's more like a treatise...

[0] https://www.cs.yale.edu/homes/aspnes/classes/202/notes.pdf

That book was used in my "intro to higher math" class my freshman year. A very humbling experience, seeing that cover again gave me a bit of a knot in my stomach.

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