       Re: Is mathematica able to transform formula

• To: mathgroup at smc.vnet.net
• Subject: [mg71875] Re: [mg71864] Is mathematica able to transform formula
• From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
• Date: Sat, 2 Dec 2006 05:10:42 -0500 (EST)
• References: <200612011122.GAA25919@smc.vnet.net>

```On 1 Dec 2006, at 20:22, ajikoe at gmail.com wrote:

> Hello,
>
> I have a question:
> if I have a symbolic expression:
> f  = a * b + 5
> c = a * b
>
> Can Mathematica builds f = c + 5 for me ?
>
>
> Sincerely Yours,
> pujo
>

There are lots of essentially equivalent ways, e.g.

Solve[{f == a*b + 5, c == a*b}, f, {a, b}]

{{f -> c + 5}}

Eliminate[{f == a*b + 5, c == a*b}, {a, b}]

f - 5 == c

GroebnerBasis[{f-a *b-5,c-a*b},{f,c},{a,b}]

{c-f+5}

and so on.

Andrzej

```

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