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Oscar_Cunningham comments on Group rationality diary, 9/17/12 - Less Wrong Discussion
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I've been using it to memorise useful mathematical formulae like trig identities and integrals. Obviously rote learning mathematics can be harmful, but there are some formulae (like the one for tan(A+B)) that come up often enough to be useful but not often enough for me to have memorised them automatically. This is the sweet spot for spaced repetition.
Also, remembering people's birthdays seems like a good use of Anki.
I considered a table of integrals too, but it's rare that I come across an integral these days that I should be doing rather than handing off to Mathematica (or it's a specialized one like a Laplace transform). The birthdays idea is a good one, but Google Calendar does that for me far more effectively.
I might want to do one for the names of prominent theorems, though. Then I'll be able to just say "the Cayley Hamilton theorem" instead of "you can express any function of a matrix as a combination of N-1 powers of that matrix."