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MathGroup Archive 2005

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Re: limit problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg58943] Re: limit problem
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Sun, 24 Jul 2005 01:22:02 -0400 (EDT)
  • Organization: The Open University, Milton Keynes, England
  • References: <dbt3lm$sk4$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Chris Chiasson wrote:
> 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
> 
> Regards,
Hi Chris,

The following works:

In[1]:=
Limit[E^(-t), t -> Infinity]

Out[1]=
0

In[2]:=
Limit[E^((-R)*t), t -> Infinity]

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

In[3]:=
Assuming[R > 0, Limit[E^((-R)*t), t -> Infinity]]

Out[3]=
0

Best regards,
/J.M.


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