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Re: How to get sqrt(Year^2)===Year?

• To: mathgroup at smc.vnet.net
• Subject: [mg75766] Re: [mg75724] How to get sqrt(Year^2)===Year?
• From: DrMajorBob <drmajorbob at bigfoot.com>
• Date: Thu, 10 May 2007 05:11:23 -0400 (EDT)
• References: <23198170.1178701346748.JavaMail.root@m35>
• Reply-to: drmajorbob at bigfoot.com

Use PowerExpand.

Bobby

On Wed, 09 May 2007 03:33:05 -0500, Hatto von Aquitanien  =

<abbot at AugiaDives.hre> wrote:

> If I have some expression which takes the square root of a square, it
> evaluates leaving the whole square root expression unchanged.
>
> Year == (Year^2)^(1/2)
>
> just returns what I entered when evaluated.
>
> Year == Year
>
> evaluates to True.
>
> How do I persuade Mathematica to evaluate the first expression  =

> completely?



-- =

DrMajorBob at bigfoot.com