Re: simple Simplify[] question

*To*: mathgroup at smc.vnet.net*Subject*: [mg19867] Re: simple Simplify[] question*From*: adam.smith at hillsdale.edu*Date*: Sun, 19 Sep 1999 01:20:49 -0400*Organization*: Deja.com - Share what you know. Learn what you don't.*References*: <7rnkqn$emf@smc.vnet.net> <7rskd8$qan$2@dragonfly.wolfram.com>*Sender*: owner-wri-mathgroup at wolfram.com

Many similar questions concerning declaring variables to be positive or real, etc. have come up. As far as I have been able to tell there is no good way to do it in 3.0. This seems to me the biggest useful improvement made in 4.0. If someone does provide a solution in 3.0 please email it to me (adam.smith at hillsdale.edu). I am personally a little upset that they want $375 to upgrade to 4.0, which seems to me in many ways a fix of some of the deficiencies found in Ver 3. I mean I only had 3.0 for about 8 months before 4.0 came out. I realize that product cycles for software are decreasing. However, I am a little hesitant to pay that kind of money for 4.0 when instead of fixing the problems in 4.0, Wolfram might replace with 5.0 it and force me to pay a considerable amount again to upgrade. Just seems bad customer relations to me. Adam Smith In article <7rskd8$qan$2 at dragonfly.wolfram.com>, Ulf Saalmann <us at atom.msi.se> wrote: > 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? > > Yes, the second result is correct only for positive a. > But, how to tell it Mathematica (Version 3.0)? > And how to tell Mathematica that a variable is real? > > Thanks > Ulf (us at atom.msi.se) > > Sent via Deja.com http://www.deja.com/ Share what you know. Learn what you don't.