Re: How to solve this type of equation in Mathematica?
- To: mathgroup at smc.vnet.net
- Subject: [mg60072] Re: How to solve this type of equation in Mathematica?
- From: spousta at yahoo.com
- Date: Thu, 1 Sep 2005 02:13:08 -0400 (EDT)
- References: <firstname.lastname@example.org>
- Sender: owner-wri-mathgroup at wolfram.com
Hi try to suppose f(x) in the form a /(x^3) for an unknown parameter a Equal[Integrate[Times[Plus[P, x], Times[a, 1/(x x x)]], List[x, P, DirectedInfinity]], 1] Then you get a = 2 P / 3 The same game can be played with another integrable functions - I suspect you will have too much possible solutions :-) Greetings Jan Jeffrey Lyons wrote: > Hi, I would like to be able to solve the equation: > > Equal[Integrate[Times[Plus[P, x], f[x]], List[x, P, > DirectedInfinity]], 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.