MathGroup Archive: July 2008 [00697]

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Re: Unprotect[Pi]

To: mathgroup at smc.vnet.net
Subject: [mg90848] Re: Unprotect[Pi]
From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
Date: Sat, 26 Jul 2008 04:21:23 -0400 (EDT)
Organization: The Open University, Milton Keynes, UK
References: <g6c99d$bu2$1@smc.vnet.net>

Scott wrote:

> How does one unprotect symbol Pi and the Greek lower case letter pi
> (&#960;)?  Unprotect[Pi] doesn't seem to do the job.
> 
> Pi // N
> 3.14159
> Unprotect[Pi]
> {Pi}
> Pi
> &#960;
> Pi // N
> 3.14159
> Unprotect[&#960;]
> &#960;//N
> 3.14159

I am not sure to have grasped what your try to achieve, but Unprotect[] 
works fine on my system. The following redefines the value of Pi to the 
nonsensical complex number 3 - I

     In[1]:= Unprotect[Pi];
             Pi = 3 - I;
             Protect[Pi];
             Pi

     Out[4]= 3 - I

Regards,
-- Jean-Marc

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