Replacement

*To*: mathgroup at smc.vnet.net*Subject*: [mg4433] Replacement*From*: ges at vsnhdd.cern.ch (Sergej Gerassimov)*Date*: Mon, 22 Jul 1996 01:59:48 -0400*Organization*: European Organization for Nuclear Research, Geneva*Sender*: owner-wri-mathgroup at wolfram.com

Hi, I have something like x/Sqrt[a^2+b^2]+Sqrt[a^2+b^2]/y and I'd like to substitute Sqrt[a^2+b^2] by r. x/Sqrt[a^2+b^2]+Sqrt[a^2+b^2]/y //. Sqrt[a^2+b^2]->r gives: x r ------------- + - Sqrt[a^2+b^2] y (replace one only in the numerator) How to replace Sqrt[a^2+b^2] by r everywhere in the expression? Thanks. S. ==== [MESSAGE SEPARATOR] ====