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Re: Integration question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg21015] Re: [mg20966] Integration question
  • From: "Tomas Garza" <tgarza at mail.internet.com.mx>
  • Date: Thu, 2 Dec 1999 21:41:27 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

V Stokes [birdy00 at bu.edu] wrote:

> Please try the following simple tests:
> 
> 
>      Integrate[Exp[x-a],x]
> 
> then,
> 
>     Integrate[Exp[x-a],{x,-Infinity,a}]
> 
> I get the following solution (with Mathematica 3.01)
> 
>  If[a<0,1,...]
> 
> Is this the intended solution for this integral? A simple calculation
> shows that this integral will evaluate to 1 for any a > 0 !

The following was made on Version 4:

In[1]:=
Clear[a, x]
In[2]:=
     Integrate[Exp[x - a], x]

Out[2]=
\!\(\[ExponentialE]\^\(\(-a\) + x\)\)
In[3]:=
    Integrate[Exp[x - a], {x, -Infinity, a}]

Out[3]=
1

Tomas Garza
Mexico City


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