       Re: How to "Factorize" expanded derivatives

• To: mathgroup at smc.vnet.net
• Subject: [mg17186] Re: How to "Factorize" expanded derivatives
• From: "Hemming A Schaeffer" <has at dhi.dk>
• Date: Tue, 20 Apr 1999 01:20:59 -0400
• Organization: Customer at Tele Danmark Erhverv
• References: <7f9evt\$50m@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```Thanks to a couple of people providing me with a personal response on how
the functions Integrate and Hold can be used to solve the specific problem I
posed (see below).

However, my final need is related to complicated expressions with multiple
partial derivatives. Thus, the function I am looking for is one, which is
able to experiment a little (like Simplify) on how to arrange (nest) partial
derivatives of different orders and variables to get the most simple
representation of some expression.

Thanks for any new tips

Hemming

Hemming A Schaeffer wrote in message <7f9evt\$50m at smc.vnet.net>...
>Consider the operation
>
>D[f[x]g[x],x]=g[x]f'[x]+f[x]g'[x]
>
>Does anyone know how to make Mathematica perform the inverse operation. I
>guess what I am looking for is some kind of Simplify Function using
>differentiation rules. Something resembling the Factor Function would also
>be nice.
>
>Thanks for any tips
>
>Hemming
>
>
>
>
>

```

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