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How to solve this type of equation in Mathematica?

• To: mathgroup at smc.vnet.net
• Subject: [mg59887] How to solve this type of equation in Mathematica?
• From: poster at giganews.com
• Date: Wed, 24 Aug 2005 06:32:40 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Hi, I would like to be able to solve the equation:

Equal[Integrate[Times[Plus[P, x], f[x]], List[x, P,
DirectedInfinity[1]]], 1]

in Mathematica.  Is there any way to do this?

That is I would like to solve for f(x) when we know that 
integrating  (x + P) f(x) from P to Infinity over x equals 1.

• Follow-Ups:
  • Re: How to solve this type of equation in Mathematica?
    • From: "benshimo@bgumail.bgu.ac.il" <bsyehuda@gmail.com>