Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2007
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2007

[Date Index] [Thread Index] [Author Index]

Search the Archive

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 




  • Prev by Date: graphing curves in the complex plane
  • Next by Date: Re: axes labeling
  • Previous by thread: Re: How to get sqrt(Year^2)===Year?
  • Next by thread: Re: How to get sqrt(Year^2)===Year?