Re: Approximation

*To*: mathgroup at smc.vnet.net*Subject*: [mg116449] Re: Approximation*From*: "Ingolf Dahl" <ingolf.dahl at telia.com>*Date*: Wed, 16 Feb 2011 04:32:58 -0500 (EST)

I would form a new variable eps, such that R = eps G, eliminate R from the expression, so that the expression becomes a function of eps, and then make a power series expansion in eps about eps == 0, using the command Series or SeriesCoefficient. Then I would keep the first non-vanishing term, and maybe some more terms, depending on the problem. At the end I might back-substitute R again. Best regards Ingolf Dahl Sweden ingolf.dahl at telia.com > -----Original Message----- > From: Rui [mailto:rui.rojo at gmail.com] > Sent: den 15 februari 2011 12:35 > To: mathgroup at smc.vnet.net > Subject: [mg116438] Approximation > > Is there a way to tell Mathematica to simplify and approximate an > expression assuming things such as "R is a lot smaller than G"/ R<<G ? > If not so, how would you approach the problem? > > Thanks