[Question] Request for small textbook recommendations

I’d love recommendations for good textbooks that are short.

I like books to be physically smaller so that they’re easier to hold and carry around, and I’d also like to be able to at least plausibly believe that I might read the whole thing. I was a math and physics major, so I can pick up most undergrad or graduate textbooks and at least have a chance at understanding what’s going on.

I’m mostly thinking about math & physics but am very happy to get recommendations for any field! I’d love to acquire more of a sense of what various fields are about at the professional level. I’m also happy with books that straddle the genres of textbook and popular non-fiction. Highly-readable academic papers are also very welcome! (This post is great, but doesn’t have anything to do with size.)

I’ll post some examples as answers.

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