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

• To: mathgroup at smc.vnet.net
• Subject: [mg75822] Re: How to get sqrt(Year^2)===Year?
• From: "Drago Ganic" <dganic at vodatel.net>
• Date: Fri, 11 May 2007 05:30:42 -0400 (EDT)
• References: <f1upcr$8e6$1@smc.vnet.net>

[snip]

>
> However, you can use the Mathematica PowerExapnd to cause
> (Year^2)^(1/2) to evaluate to Year, i.e.
>
> In[1]:= Year == (Year^2)^(1/2) // PowerExpand
>
> Out[1]= True
>
> Just be aware this transformation will not be valid in general.

Hi,
I just want to add that the old V1 function "PowerExpand" has in V6 the 
Assumptions option.

See the examples in
http://reference.wolfram.com/mathematica/ref/PowerExpand.html?q=PowerExpand

It's very nice documented now. Great job WRI people.

Greetings from Croatia,
Drago