Re: Simplifying things
- To: mathgroup at smc.vnet.net
- Subject: [mg26095] Re: [mg26070] Simplifying things
- From: Tomas Garza <tgarza01 at prodigy.net.mx>
- Date: Tue, 28 Nov 2000 01:55:39 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
Unfortunately, V.3 has not yet incorporated a nice feature of Simplify, viz. Assumptions. In Version 4 your problem would be easily taken care of by means of In[1]:= Simplify[Sqrt[a^2], a > 0] Out[1]= a In Version 3 you get In[2]:= Simplify[Sqrt[a^2]] Out[2]: Sqrt[a^2] because Mathematica doesn't know whether a>0. One possible way out - if you know that a>0 - would be to replace a by Abs[a] and then back again: In[3]:= (Sqrt[a^2] /. a -> Abs[a]) /. Abs[a] -> a Out[3]= a Tomas Garza Mexico City <djago at my-deja.com> wrote: > I need to simplify looooong equations, but don't know how to get rid of > those terms like: > > Sqrt[a^2] > > when a is a real positive variable... How can I tell Mathematica 3 to > simplify this?