Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2002
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2002

[Date Index] [Thread Index] [Author Index]

Search the Archive

FullSimplify[Abs[Sign[x]],x>=0] equals 1?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg33691] FullSimplify[Abs[Sign[x]],x>=0] equals 1?
  • From: Alain Cochard <al2 at noos.fr>
  • Date: Tue, 9 Apr 2002 01:01:51 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Is the following behavior normal?  


In[1]:= Simplify[Abs[Sign[x]],x>=0]

Out[1]= Abs[Sign[x]]

In[2]:= FullSimplify[Abs[Sign[x]],x>=0]

Out[2]= 1

In[3]:= $Version

Out[3]= 4.1 for Sun Solaris (November 8, 2000)


In this case I would have expected FullSimplify to give the save
answer as Simplify, as I was (naively?) assuming Abs[Sign[0]] equals
zero.  What am I missing?  (Note I get the same output 
for Version 4.0 for Linux (July 22, 1999).)

AC



  • Prev by Date: Bayesian?
  • Next by Date: Re: list of digits to string
  • Previous by thread: Re: Bayesian?
  • Next by thread: Re: FullSimplify[Abs[Sign[x]],x>=0] equals 1?