Re: Checking the sign of a Mathematical expression

*To*: mathgroup at smc.vnet.net*Subject*: [mg66449] Re: Checking the sign of a Mathematical expression*From*: Paul Abbott <paul at physics.uwa.edu.au>*Date*: Sat, 13 May 2006 02:42:39 -0400 (EDT)*Organization*: The University of Western Australia*References*: <e3uodm$i9u$1@smc.vnet.net> <e418oq$h32$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

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