“Don't just read it; fight it! Ask your own question, look for your own examples, discover your own proofs. Is the hypothesis necessary? Is the converse true? What happens in the classical special case? What about the degenerate cases? Where does the proof use the hypothesis?”

I Want to be a Mathematician: An Automathography (1985)

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Do you have more details about the quote "Don't just read it; fight it! Ask your own question, look for your own examples, discover your own proofs. Is the hypot…" by Paul R. Halmos?
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Paul R. Halmos 9
American mathematician 1916–2006

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