gwern comments on Memory, Spaced Repetition and Life - Less Wrong
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One thing I've thought would be good to have is a program that takes math formulas and damages them, to produce plausible, similar-looking formulas but with terms missing or altered. This would be used to make a set of flash cards where you have to distinguish between real and damaged formulas.
I do this by hand for my programming flashcards. Take a correct example, make a couple broken versions of it, and review. Whenever I can't distinguish between right and wrong, make a few more that hammer on the distinction. As long as there's enough that I memorize the principle or syntactic rule or semantic concept, and not the specific examples themselves...