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MathGroup Archive 1999

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Re: A little problem with positive numbers

  • To: mathgroup at smc.vnet.net
  • Subject: [mg18088] Re: A little problem with positive numbers
  • From: Attico Nicola <nicola at Linuz.sns.it>
  • Date: Thu, 17 Jun 1999 12:26:31 -0400
  • Delivery-date: Thu Jun 17 15:35:38 1999
  • Sender: owner-wri-mathgroup at wolfram.com

On Mon, 14 Jun 1999, Murray Eisenberg wrote:

> What, exactly, are you trying to do?  And what version of Mathematica?
> 
> The new Version 4 "Support for assumptions in Simplify, FunctionExpand
> and related functions" may do what you need.
> 

Really im using version 3.
Im tryng to calculate something like
(in my case is a bit more complex but the problem
is the same):

In[1]=Integrate[E^(-v^2/vth^2),{v,-Infinity,+Infinity}]

and i obtai a complex result:

Out[1]=If[Re[vth^2]>0,Sqrt[Pi]Sqrt[vth^2],Integrate[E^(-v^2/vth^2),
{v,-Infinity,+Infinity})]]

I would like to communicate to Math that
im sure vth is a positive number.

Bye and thank you for any help

Nicola


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