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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>