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Re:Why won’t anyone teach me math? by mjh2539 on Friday February 11, 2022 @10:49AM (#30302779)
If they know how to do (rigorous) proofs, then Spivak would be good. Otherwise it would be far too advanced. It's essentially an introduction to analysis.
Re:Why won’t anyone teach me math? by Spivak on Friday February 11, 2022 @11:01AM (#30302949)
That's fair. I don't really know what counts as advanced anymore. There just aren't that many books on theoretical math that aren't "graduate level" (which is way scarier than it sounds) -- Spivak was my Real Analysis 101 book as a freshman math major.

Spivak at least has the nice property that it doesn't assume you know much.