Re: Substiuting variables within an integral

*To*: mathgroup at smc.vnet.net*Subject*: [mg111383] Re: Substiuting variables within an integral*From*: "Eduardo M. A. M.Mendes" <emammendes at gmail.com>*Date*: Thu, 29 Jul 2010 06:45:53 -0400 (EDT)

Hi Simon Since I am a newbie I wonder whether you would have a simple example. Many many thanks Ed -----Original Message----- From: Simon [mailto:simonjtyler at gmail.com] Sent: Wednesday, July 28, 2010 3:53 AM To: mathgroup at smc.vnet.net Subject: [mg111383] [mg111335] Re: Substiuting variables within an integral Hi Ed, You can try working with the integrand and limits with out the integral. Something like f[x] Dt[x] && x0<x<x1 Then using replacement rules should just work. The total derivative Dt[] assumes that everything is a variable, so if you have any other parameters floating around you have to give them the attribute Constant. You can then get mathematica to check the form of the integrand - if it matches what you want, then integrate. Simon On Jul 27, 6:14 pm, "Eduardo M. A. M.Mendes" <emammen... at gmail.com> wrote: > Hello > > I need to do a variable substitution within an integral in several different > ways. I need Mathematica to rearrange the integral with the new variable > definition without solving it. The resulting integral will be variations > of Euler function. After seeing the resulting integral, I need Mathematica > to actually solve it for me (that is, Mathematica needs to recognize that it > is an Euler function). Can this be done? > > Many thanks > > Ed