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Re: Integration of Exp[-x^2]/(1 + Exp[a * x])

• To: mathgroup at smc.vnet.net
• Subject: [mg39661] Re: Integration of Exp[-x^2]/(1 + Exp[a * x])
• From: "David W. Cantrell" <DWCantrell at sigmaxi.org>
• Date: Fri, 28 Feb 2003 04:45:26 -0500 (EST)
• References: <b3hs7u$iki$1@smc.vnet.net> <b3k88r$nuk$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Marc_Noël <marc.noel at skynet.be> wrote:
> with your exact input (copy and paste) I get

Then I can't understand how Stefan's x^2 became your x2 .

> \!\(\[ExponentialE]\^\(-x2\)\ \((x -
>          Log[1 + \[ExponentialE]\^\(a\ x\)]\/a)\)\)
> it just works fine,

It's not just fine for the original problem.

David

> Stefan a écrit:
> > I have to integrate the function Exp[-x^2]/(1 + Exp[a * x]) where a is
> > real-valued parameter. Unfortunately
> >
> > Integrate[Exp[-x^2]/(1 + Exp[a * x]), x]
> >
> > yields no results. Does anyone know a clever trick I might have missed?