Substituting simpler expressions
- To: mathgroup at smc.vnet.net
- Subject: [mg78666] Substituting simpler expressions
- From: Steve Gray <stevebg at roadrunner.com>
- Date: Fri, 6 Jul 2007 03:30:34 -0400 (EDT)
Suppose I have a long complex expression in which the term exx=Sqrt[x^2+y^2-xy] (for example) appears many times. I would like to substitute say "rootxy" (for example) for it everywhere it appears. I know about doing exx/.Sqrt[x^2+y^2-xy]-> rootxy but that doesn't do it. Any tips? Thank you. Steve Gray