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Re: Substiuting variables within an integral

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  • Subject: [mg111335] Re: Substiuting variables within an integral
  • From: Simon <simonjtyler at>
  • Date: Wed, 28 Jul 2010 02:53:02 -0400 (EDT)
  • References: <> <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.


On Jul 27, 6:14 pm, "Eduardo M. A. M.Mendes" <emammen... at>
> 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

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