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).
哇，这让我对“有用的泛化形式”这个概念有了极为深刻的体会。绝对让我想起了波利亚（Polya）在《数学中的归纳与类比》里非常精彩的一节，里面讨论了不同形式的泛化，以及它何时有用（在需要解决某个具体问题的语境下）。
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).
《怎样解题》我也举双手赞同，另外我也推荐波利亚的《数学中的归纳与类比》（Induction and Analogy in Mathematics）。
I'll third How to Solve It, and would also recommend Polya's Induction and Analogy in Mathematics.