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."
This is the public group instrumental rationality diary for the week of September 17th. It's a place to record and chat about it if you have done, or are actively doing, things like:
Or anything else interesting which you want to share, so that other people can think about it, and perhaps be inspired to take action themselves. Try to include enough details so that everyone can use each other's experiences to learn about what tends to work out, and what doesn't tend to work out.
Thanks to everyone who contributes!
Previous diary; archive of prior diaries.
(Sorry for being late, I don't even have an excuse at all! Oh well.)