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Re: Substiuting variables within an integral

• To: mathgroup at smc.vnet.net
• Subject: [mg111335] Re: Substiuting variables within an integral
• From: Simon <simonjtyler at gmail.com>
• Date: Wed, 28 Jul 2010 02:53:02 -0400 (EDT)
• References: <201007250558.BAA00160@smc.vnet.net> <1280108108.3887.100.camel@warp>

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

• References:
  • Linking my fortran subroutines with Mathematica
    • From: emamm <emammendes@gmail.com>