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Re: Deleting Integrate[] transformation rule

  • To: mathgroup at smc.vnet.net
  • Subject: [mg87564] Re: Deleting Integrate[] transformation rule
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Sun, 13 Apr 2008 03:31:28 -0400 (EDT)
  • Organization: The Open University, Milton Keynes, UK
  • References: <ftq5ab$it$1@smc.vnet.net>

UHAP023 at alpha1.rhbnc.ac.uk wrote:

> When integrating Mathematica knows the result of D[EllipticF[phi,m, phi]] =
====================================================================!!
Syntax error: a square bracket is missing.

> 1/Sqrt[1-m*Sin[phi]^2]] and will produce expressions containing
> EllipticF[] in its result when it encounters such a pattern.  I want
> to prevent this -- that is Unprotect Integrate[] and make it forget
> this rule so that EllipticF[] will not appear in the result.

No need to do that: just use the correct syntax as in,

In[1]:= D[EllipticF[phi, m], phi]

Out[1]=

           1
---------------------
                    2
Sqrt[1 - m Sin[phi] ]


Regards,
-- Jean-Marc


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