Re: transforming exponential of sums into product of exponentials
- To: mathgroup at smc.vnet.net
- Subject: [mg48689] Re: [mg48654] transforming exponential of sums into product of exponentials
- From: DrBob <drbob at bigfoot.com>
- Date: Thu, 10 Jun 2004 02:44:19 -0400 (EDT)
- References: <200406090817.EAA15676@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Use RuleDelayed, and you get a bit farther. Evaluate these lines to see what I mean: Trace[Exp[x + y] /. Exp[a_ + b_] -> Exp[a]Exp[b]] Trace[Exp[x + y] /. Exp[a_ + b_] :> Exp[a]Exp[b]] The second method makes the transformation you want, but the work is undone by an automatically applied rule. This may do what you want: Exp[x + y] /. Exp[(a_) + (b_)] :> HoldForm[Exp[a]*Exp[b]] HoldForm[E^x*E^y] Bobby On Wed, 9 Jun 2004 04:17:34 -0400 (EDT), Karim Mehadhebi <Karim.Mehadhebi at wanadoo.fr> wrote: > Dear All, > > I can not understand why Mathmatica refuses to apply rules which transform > exponenials of sums into product of exponentails. > > For instance, > f[x+y] /. f[a_ + b_]-> f[a] f[b] returns f[x] f[y], > whereas > Exp[x+y] /. Exp[a_+b_]->Exp[a]Exp[b] still returns Exp[x+y] > > Any help greatly appreciated > > > > > > -- DrBob at bigfoot.com www.eclecticdreams.net/index.html
- References:
- transforming exponential of sums into product of exponentials
- From: "Karim Mehadhebi" <Karim.Mehadhebi@wanadoo.fr>
- transforming exponential of sums into product of exponentials