Comment #3 on issue 3123 by [email protected]: Naming conventions in sympy/stats/
http://code.google.com/p/sympy/issues/detail?id=3123

But E is euler's constant. If we don't want one letter names for P, I think I've seen Pr used to denote probability. If not, Prob maybe? Exp would cause confusion with exp. What about Ex?

E->Ex->Exp->Expectation
P->Pr->Prob->Probability

I like the two letter names--unambiguous but still short.

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