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Re: what would cause a symbol not to clear using Clear[name] or Remove[name]?

• To: mathgroup at smc.vnet.net
• Subject: [mg127220] Re: what would cause a symbol not to clear using Clear[name] or Remove[name]?
• From: "Nasser M. Abbasi" <nma at 12000.org>
• Date: Sun, 8 Jul 2012 22:47:04 -0400 (EDT)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com
• Delivered-to: mathgroup-newout@smc.vnet.net
• Delivered-to: mathgroup-newsend@smc.vnet.net

On 7/8/2012 8:39 PM, Bob Hanlon wrote:
> Here is an example of one way that can occur.
>
> y starts off clear
>
> ??y
>
> Global`y
>
> $Post is set to define y after any evaluation
>
> ($Post=(y=10;#)&);
>
> Now, even clearing y will set it
>
> Clear[y]
>
> ??y
>
> Global`y
>
> y=10
>

Thank you Bob;

But I did not use $Post (too advanced for me). I do
not even know what $Post does, and never used it
myself in the code.

regards,
--Nasser