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Re: Simplify exponents in output

  • To: mathgroup at smc.vnet.net
  • Subject: [mg99211] Re: [mg99155] Simplify exponents in output
  • From: "David Park" <djmpark at comcast.net>
  • Date: Thu, 30 Apr 2009 06:20:38 -0400 (EDT)
  • References: <23370564.1240992256434.JavaMail.root@n11>

Because your statement is not generally true. In particular it is not true
for negative x.

(64 x^9)^(1/3) == 4 x^3;
% /. x -> -1
False

But for positive x:

(64 x^9)^(1/3);
Simplify[%, x > 0]
4 x^3


David Park
djmpark at comcast.net
http://home.comcast.net/~djmpark/  


From: davef [mailto:davidfrick2003 at yahoo.com] 


When I attempt to solve the following  in Mathematica:

(64 x^9)^(1/3)

I get this:

4 (x^9)^1/3

Why don't I get:

4x^3

IOW, why doesn't Mathematica simplify the variable under the radical in the
output?

I am using Mathematica 7.

Thanks.




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