Services & Resources / Wolfram Forums / MathGroup Archive
-----

MathGroup Archive 2007

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Is this normal for Limit?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg82327] Re: Is this normal for Limit?
  • From: Bill Rowe <readnewsciv at sbcglobal.net>
  • Date: Wed, 17 Oct 2007 04:15:10 -0400 (EDT)

On 10/16/07 at 3:23 AM, mmandelberg at comcast.net (Michael Mandelberg)
wrote:

>I have what I would think is the following simple limit to evaluate:

>$Pre = Refine[#] &; $Assumptions = {t \[Element] Reals, k
>\[Element]Reals,  k > 0};

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

>The results is:
>
>Out[3]= Limit[\[ExponentialE]^(-k t), t -> \[Infinity]]

>In other words Mathematica 6.0.0 punts on this.  Is there any sense
>in which this limit is not well-defined?

I seem to recall seeing a posts here discussing issues with
using $Assumptions. Using Assuming as follows:

In[14]:= Assuming[k > 0, Limit[Exp[-k t], t -> Infinity]]

Out[14]= 0

works
--
To reply via email subtract one hundred and four


  • Prev by Date: Mathematica 6.01 and openSUSE 10.3
  • Next by Date: Re: Is this normal for Limit?
  • Previous by thread: Re: Is this normal for Limit?
  • Next by thread: Re: Is this normal for Limit?