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Substitution in order should take care of NegativeInfinity #8568

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Substitution in order should take care of NegativeInfinity #8568

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avichaldayal
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Fixes #7872

The following substiution now works:

In [1]: O(x**3).subs(x, exp(-x**2))
Out[1]: 
 ⎛     2        ⎞
 ⎜ -3⋅x         ⎟
O⎝ℯ     ; x → -∞⎠

@skirpichev
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Please add test.

@skirpichev
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Why not

 ⎛     2        ⎞
 ⎜ -3⋅x         ⎟
O⎝ℯ     ; x →  ∞⎠

?

@skirpichev
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btw, this doesn't fix XFAILed test in #8542

@mihir-w mihir-w mentioned this pull request Feb 14, 2015
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Substitution in Order fails
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@avichaldayal @skirpichev @czgdp1807