Re: simple Simplify[] question

*To*: mathgroup at smc.vnet.net*Subject*: [mg19790] Re: simple Simplify[] question*From*: Adam Strzebonski <adams at wolfram.com>*Date*: Fri, 17 Sep 1999 01:36:45 -0400*Organization*: Wolfram Research, Inc.*References*: <7rnkqn$emf@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Ulf Saalmann wrote: > > Hello, > > why gives Mathematica > 2 3/2 > Simplify[(a^2)^(3/2)] (a ) > > and not > 3 > a > > and how to convince Mathematica to do it? > > Thanks > Ulf (us at atom.msi.se) There are values of a for which (a^2)^(3/2) is not equal to a^3. In[5]:= {(a^2)^(3/2), a^3} /. a->-1 Out[5]= {1, -1} In V4 you can give assumptions to Simplify, and if you assume that a>=0 you get the simplification. In[6]:= Simplify[(a^2)^(3/2), a>=0] 3 Out[6]= a Best Regards, Adam Strzebonski Wolfram Research