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Re: Is mathematica able to transform formula

• To: mathgroup at smc.vnet.net
• Subject: [mg71877] Re: Is mathematica able to transform formula
• From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
• Date: Sat, 2 Dec 2006 05:10:43 -0500 (EST)
• Organization: The Open University, Milton Keynes, UK
• References: <ekp4gh$28t$1@smc.vnet.net>

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
> 

Use transformation rules [1]. For example,

f = a * b + 5
c = a * b

--> 5 + a*b
--> a*b

c = .
f /. a * b -> c

--> 5 + c


Regards,
Jean-Marc

1. _The Mathematica Book_, /Section 2.5: Transformation Rules and 
Definitions/, http://documents.wolfram.com/mathematica/book/section-2.5