The Volokh Conspiracy
Mostly law professors | Sometimes contrarian | Often libertarian | Always independent
Not quite, but
e^(9+10)πi = e^21πi
So there. (If your household isn't as steeped in the 9+10=21 meme as is mine, coming from my 10- and 11-year-olds and their school chums, see here. And, yes, there are other "proofs" that 9+10=21, too.)
UPDATE: Uh-oh—the superscript HTML tags don't seem to be working, so I switched to using ^ to indicate exponentiation.