Re: Simplifying with positive constants
- To: mathgroup at smc.vnet.net
- Subject: [mg26079] Re: [mg26062] Simplifying with positive constants
- From: Matt.Johnson at autolivasp.com
- Date: Tue, 28 Nov 2000 01:55:27 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
You just need to specify some assumptions for Simplify or FullSimplify to use: In[10]:= Simplify[1/2(r*a - a*d - Sqrt[4*r*a^2*d + (-r*a + a*d)^2]), a > 0 && r > 0 && d > 0] Out[10]= -a d -matt djago at my-deja.com on 11/21/2000 11:55:51 PM cc: Subject: [mg26079] [mg26062] Simplifying with positive constants I'm trying to calculate some results and when I evaluate them I get: 1/2(r*a-a*d-Sqrt[4*r*a^2*d+(-r*a+a*d)^2] I know that this is a complicated way of saying: r*a but Mathematica (3.0) doesn't seems to get the idea... I've tried with FullSimplify and so on... but Mathematica won't let a go out of the Sqrt function. Maybe If I could tell Mathematica that a, r and d are real and positive values... Can somebody give me a hint of how to do this??? Thx! Sent via Deja.com http://www.deja.com/ Before you buy.