Comment #3 on issue 2200 by ness...@googlemail.com: limit(sin(x),x,oo) should raise an error
http://code.google.com/p/sympy/issues/detail?id=2200
We need a general way to describe and test for singularities. In particular Wild('a')*oo should be recognisable as "usually singular".
This will then allow the code from issue 905 to handle (acos(1+a*x**2)).series(x), which currently returns funny expressions involving a*oo.
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