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ciphergoth comments on Open Thread: January 2010 - Less Wrong
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Is there such a convention? We don't say that one is prime. e^x is often said to be the only function that is its own derivative, as if the zero function somehow didn't count.
ke^x is its own derivative for any k, including 0. It's a lot more convenient for 1 not to be prime. But 0! = 1, for example.