Comment #8 on issue 2293 by [email protected]: Unexpected limit
behaviour
http://code.google.com/p/sympy/issues/detail?id=2293
In [11]: limit(x**-1,x,0)
Out[11]: ∞
In [12]: x=9
In [13]: limit(x**-1,x,0)
---------------------------------------------------------------------------
NotImplementedError Traceback (most recent call last)
/home/john/<ipython console> in <module>()
/usr/lib/pymodules/python2.7/sympy/series/limits.pyc in limit(e, z, z0, dir)
89
90 try:
---> 91 r = gruntz(e, z, z0, dir)
92 except PoleError:
93 r = heuristics(e, z, z0, dir)
/usr/lib/pymodules/python2.7/sympy/series/gruntz.pyc in gruntz(e, z, z0,
dir)
492 """
493 if not isinstance(z, Symbol):
--> 494 raise NotImplementedError("Second argument must be a
Symbol")
495
496 #convert all limits to the limit z->oo
NotImplementedError: Second argument must be a Symbol
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