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