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Re: Re: Limit Question

  • To: mathgroup at
  • Subject: [mg66479] Re: [mg66459] Re: [mg66452] Limit Question
  • From: "David Park" <djmp at>
  • Date: Mon, 15 May 2006 23:49:08 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

And yes, the Mathematica Help for Limit DOES now say that Assumptions is an
option - but it is interesting that almost everyone missed that and use the
Assuming statement instead. And wondered why it worked!

I guess it pays to read the Help carefully for newer features, such Assuming
and $Assumptions.

David Park
djmp at

From: Carl K. Woll [mailto:carlw at]
To: mathgroup at

Blimbaum, Jerry CIV NSWC PC wrote:
> Why do these give no output?
> Simplify[Limit[Exp[-a t],t->Infinity],a>0]
> and  same for
> Simplify[Limit[Exp[a t],t->Infinity],a<0]
> thanks...
> Jerry Blimbaum

Try sticking the assumption inside of Limit:

In[11]:= Limit[Exp[-a t], t -> Infinity, Assumptions -> a > 0]

Out[11]= 0

In[12]:= Limit[Exp[a t], t -> Infinity, Assumptions -> a < 0]

Out[12]= 0

Carl Woll
Wolfram Research

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