What are your favorite books on mathematics?

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What are your favorite books on mathematics?
I liked A Concise history of mathematics by Dirk Struik.
And also a biography of Erdös.
I don't like Lay linear algebra, but I like Calculus from Michael Spivak.
Which I'm reading right now. I don't do all the exercises when I finish a chapter, but after a couple of chapter I return and try some exercises from the previous chapters.

I like Introduction to Analysis by Wade.

I'm reading Advanced Calculus by Widder right now, among other non-math things. I haven't taken a math class in two years, though, so I find myself needing to supplement the reading sometimes.

I don't know if the Erdös number serie will diverge or converge. I hope it will diverge.