Re: how to specify something is "real"
- To: mathgroup at smc.vnet.net
- Subject: [mg43168] Re: how to specify something is "real"
- From: Florian Schaudel <Florian at schaudel.com>
- Date: Sat, 16 Aug 2003 02:53:51 -0400 (EDT)
- References: <bhi5j3$hne$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
"pgp" <bla at bla.com> wrote in news:bhi5j3$hne$1 at smc.vnet.net: > Hi, > This is probably a dumb question, but I was trying to use Conjugate[] > on an expression that contains terms like Cos[x], and mathematica > doesn't take it for granted that Cos[x] is real, and hence the end > result contain lots of Conjugate's that can't be reduced. > Could someone tell me if it's possible to tell mathematica which parts > of the expressions are supposed to be real, so it'll get rid of all > those Conjugates? > Thanks a lot. > -K An easy workaround is to user Re[Cos[x]] instead of Cos[x]. If Cos[x] is a real number it makes no difference in result, but Mathematica "knows" it is real. Florian