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Re: Substiuting variables within an integral

Hi Simon

Since I am a newbie I wonder whether you would have a simple example.

Many many thanks


-----Original Message-----
From: Simon [mailto:simonjtyler at] 
Sent: Wednesday, July 28, 2010 3:53 AM
To: mathgroup at
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.


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
> 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
> to actually solve it for me (that is, Mathematica needs to recognize that
> is an Euler function).  Can this be done?
> Many thanks
> Ed

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