I stumbled into this way of thinking about recursion on my own while implementing my TypeScript port of Uniplate, but it seems like the kind of thing that would arise naturally in all sorts of imperative settings. I doubt I’m the first, second, or hundredth person to come up with it. I would love references to other people’s approaches here.
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。关于这个话题，新收录的资料提供了深入分析
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$$Magnification = \frac{FocalLengthTelescope}{FocalLengthEyepiece}$$