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Re: limit problem

• To: mathgroup at smc.vnet.net
• Subject: [mg58930] Re: limit problem
• From: "Carl K. Woll" <carlw at u.washington.edu>
• Date: Sun, 24 Jul 2005 01:21:50 -0400 (EDT)
• Organization: University of Washington
• References: <dbt3lm$sk4$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

"Chris Chiasson" <chris.chiasson at gmail.com> wrote in message 
news:dbt3lm$sk4$1 at smc.vnet.net...
> Dear MathGroup,
> Honestly, I see no reason why this should return "unevaluated" instead of 
> zero.
>
> FullSimplify[Limit[E^(-R 
> t),t\[Rule]Infinity],Infinity>R>0&&Element[R,Reals]]
>
> 5.2 on windows
>

If you give the assumption directly to Limit, then you can get the answer 
you want:

In[5]:=
Limit[Exp[-R t], t -> Infinity, Assumptions -> R > 0]
Out[5]=
0

Carl Woll
Wolfram Research

> Regards,
> -- 
> Chris Chiasson
> http://chrischiasson.com/
> 1 (810) 265-3161
>