transforming exponential of sums into product of exponentials

*To*: mathgroup at smc.vnet.net*Subject*: [mg48654] transforming exponential of sums into product of exponentials*From*: "Karim Mehadhebi" <Karim.Mehadhebi at wanadoo.fr>*Date*: Wed, 9 Jun 2004 04:17:34 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

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

**Follow-Ups**:**Re: transforming exponential of sums into product of exponentials***From:*DrBob <drbob@bigfoot.com>

**Re: transforming exponential of sums into product of exponentials***From:*Adriano Pascoletti <pascolet@dimi.uniud.it>