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What Hacker News says
Wow, this really struck home the idea of useful forms of generality for me. Definitely reminded me of an interesting section in Polya's book Induction and Analogy in Mathematics that discusses different forms of generality, and when it's useful (in the context of a problem to figure out).
I'll third How to Solve It, and would also recommend Polya's Induction and Analogy in Mathematics.