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Websites hosting free math ebooks. [duplicate]
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Free, high quality mathematical writing online?
Most helpful math resources on the web
A lot has been said about different kinds of math resources here in MO.
To mention a ...
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Are there any books that take a 'theorems as problems' approach?
Are there any books that present theorems as problems? To be more specific, a book on elementary group theory might have written: "Theorem: Each group has exactly one identity" and then show a proof ...