Re: Checking the sign of a Mathematical expression
- To: mathgroup at smc.vnet.net
- Subject: [mg66471] Re: Checking the sign of a Mathematical expression
- From: "Steve Luttrell" <steve_usenet at _removemefirst_luttrell.org.uk>
- Date: Sun, 14 May 2006 02:58:28 -0400 (EDT)
- References: <e3uodm$i9u$1@smc.vnet.net> <e418oq$h32$1@smc.vnet.net> <e43vov$8uq$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
"Paul Abbott" <paul at physics.uwa.edu.au> wrote in message news:e43vov$8uq$1 at smc.vnet.net... > In article <e418oq$h32$1 at smc.vnet.net>, > "Steve Luttrell" <steve_usenet at _removemefirst_luttrell.org.uk> wrote: > >> Here are two examples of what you want: >> >> Simplify[Sign[x^2],x>0] >> 1 >> >> Simplify[Sign[Sin[x]^2],0<x<Pi] >> 1 > > I think that Reduce is preferable: > > Reduce[x^2 > 0, x] > > Reduce[Sin[x]^2 > 0 && 0 <= x <= 2 Pi, x] > > Reduce[Sin[x]^2 > 0, x, Reals] > > Cheers, > Paul > > _______________________________________________________________________ > Paul Abbott Phone: 61 8 6488 2734 > School of Physics, M013 Fax: +61 8 6488 1014 > The University of Western Australia (CRICOS Provider No 00126G) > AUSTRALIA http://physics.uwa.edu.au/~paul > Agreed. Sometimes I wonder what I was originally thinking of when I reread my posts. And I think I should have chosen better examples anyway! Steve Luttrell West Malvern, UK