MathGroup Archive: September 2009 [00524]

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Replace not spotting a replacement

To: mathgroup at smc.vnet.net
Subject: [mg103399] Replace not spotting a replacement
From: "claranet news" <david at carter-hitchin.clara.co.uk>
Date: Sun, 20 Sep 2009 06:21:47 -0400 (EDT)

Hi Folks,

Seems the replace function is being a bit dim here.  This fails:

Sqrt[2 \[Pi]] \[Tau]^(3/2) /. Sqrt[ 2 \[Pi] \[Tau]] -> \[Mu]

Apologies if this is an FAQ - I couldn't see anything about it.  What do I 
need to do here to coerce Mathematica into making this replacement? I tried using the 
Collect function on tau first, but that didn't seem to work.  I also tried 
re-writing the replacement rule as

Sqrt[2 \[Pi]] \[Tau]^(3/2) /. Sqrt[ 2 \[Pi] ] t^(1/2) -> \[Mu]

But still no joy.

Anyone know?

Many thanks,
David.

Follow-Ups:
- Re: Replace not spotting a replacement
  - From: danl@wolfram.com
- Re: Re: Replace not spotting a replacement
  - From: DrMajorBob <btreat1@austin.rr.com>
- Re: Replace not spotting a replacement
  - From: danl@wolfram.com
- Re: Replace not spotting a replacement
  - From: Adriano Pascoletti <adriano.pascoletti@dimi.uniud.it>

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