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Re: Is this normal for Limit?


No, this was a bug, an inconsistency in handling of assumptions via $Assumptions vs through the Assumptions option:

In[1]:= $Assumptions = {k > 0};

In[2]:= Limit[Exp[-k t], t -> Infinity] //InputForm

Out[2]//InputForm= Limit[E^(-(k*t)), t -> Infinity]

In[3]:= Limit[Exp[-k t], t -> Infinity, Assumptions->$Assumptions]

Out[3]= 0

Note that if you avoid the list, everything works.

This is already fixed internally, and will appear in a future release.

Sorry for the inconvenience.

Bhuvanesh,
Wolfram Research


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