Re: assumptions question

• To: mathgroup at smc.vnet.net
• Subject: [mg21934] Re: assumptions question
• From: "FRESSENGEAS Nicolas" <nicolas.fressengeas at supelec.fr>
• Date: Fri, 4 Feb 2000 02:55:01 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

```I think there are still lots of bugs in the assumptions part of Simplify.
Just tell Mathematica developers so they will include this in the next
generation :-<>

--
_____________________________________________
Dr. Nicolas Fressengeas
Equipe de Recherche en Photonique et Opto=E9lectronique
Sup=E9lec, 2 rue E.Belin, 57070 METZ Cedex
Tel: 33 387 764 705 ... Fax: 33 387 764 700
http://www.ese-metz.fr/metz/personnel/fresseng/fresseng.html
Plan d'acc=E8s:
http://www.iti.fr/PlanPerso/affichplan.hei?codeunique==23704&noplan==1

When everything else fails, read the instructions...

Peter Jay Salzman <psalzman at landau.ucdavis.edu> a =E9crit dans le message :
87b0rh\$o6c at smc.vnet.net...
> Dear all,
>
> I have an integral whose output contains things which look like:
>
> (Sign[m] - I Sign[h t])
>
> Since m is mass, h is hbar and t > 0, I placed placed a:
>
> Assumptions -> {Sign[m] > 0, Sign[t h] > 0}
>
> inside the Integrate[ ] command.
>
> Integrate[ Sin[k r]/(k r) * Exp[-I*(h k)^2 t /(2 m h)],
> Assumptions-> {Sign[m] > 0, Sign[t h] > 0},
> {k, 0, Infinity}]
>
> It seems to be ignoring me.  The Sign[m]'s keep showing up.  Is there a
way
> to tell Mathematica that m is always positive?  I *thought* this was the
way of
> doing it...
>
> pete
>
>

```

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