Re: Reduce an expression into a given form

• To: mathgroup at smc.vnet.net
• Subject: [mg130943] Re: Reduce an expression into a given form
• From: Alexei Boulbitch <Alexei.Boulbitch at iee.lu>
• Date: Tue, 28 May 2013 04:14:48 -0400 (EDT)
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```Hello,

I have an expression of the form N[a,b,c]/D[a,b,c] with a, b and c some parameters on which N and D depend. I have to transform it into something like A[a,b]/c with A that does not depend on c. Is there any function in Mathematica that can do that?
Thanks a lot for any help.

Francesco

Hi, Francesco,

To my knowledge there is no such function that will do it for any N and D. It is for the reason that the statement of problem you give above is much too general. Indeed, such a representation N[a,b,c]/D[a,b,c]= A[a,b]/c does not exist for any N and D, but only for some their combinations.

However, if the expression N[a,b,c]/D[a,b,c] may be represented in the form you need, then it can be done within Mathematica. Whether or not it be easy, is another question. I suggest that you give the expressions in the explicit form.

Have fun, Alexei

Alexei BOULBITCH, Dr., habil.
IEE S.A.
ZAE Weiergewan,
11, rue Edmond Reuter,
L-5326 Contern, LUXEMBOURG

Office phone :  +352-2454-2566
Office fax:       +352-2454-3566
mobile phone:  +49 151 52 40 66 44

e-mail: alexei.boulbitch at iee.lu

```

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