Comment #2 on issue 1944 by [email protected]: limit() returns incorrect answer for limit(exp(-x/a), x, oo)
http://code.google.com/p/sympy/issues/detail?id=1944
In making this change a crack appeared in Order's contains() method: in order to process symbols in O() terms they need to pass through sign as having a a sign, so a loophole in the logic of assigning the sign of an object was retained: if the object is a Symbol then it is assumed to be positive. The OP example now fails since the sign of -1/a is requested while contains() continues to work as it does presently in master. It would be better to figure out how to correct contains to not have to depend on sign assumptions, but in the meantime, sympy will be more conservative about limits.
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