Services & Resources / Wolfram Forums
MathGroup Archive
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2004

[Date Index] [Thread Index] [Author Index]

Search the Archive

Simplifying Expressions with Ratios of Factors

  • To: mathgroup at
  • Subject: [mg48579] Simplifying Expressions with Ratios of Factors
  • From: "David Park" <djmp at>
  • Date: Sat, 5 Jun 2004 07:19:53 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

Dear MathGroup,

I can do the following but not in a way that totally pleases me. It exemplifies a common problem of simplifying expressions that contain a ratios of factors that we wish to combine.

What is the best way to simplify expr1 to expr2?

expr1 = d\[Tau]^2 == (dt^2*(m - 2*\[Rho])^2)/(m + 2*\[Rho])^2 - 
    ((m + 2*\[Rho])^4*(d\[Rho]^2 + d\[Theta]^2*\[Rho]^2 + d\[Phi]^2*\[Rho]^2*

expr2 = d\[Tau]^2 == (dt^2*(m/(2*\[Rho]) - 1)^2)/(m/(2*\[Rho]) + 1)^2 - 
    (m/(2*\[Rho]) + 1)^4*(d\[Rho]^2 + d\[Theta]^2*\[Rho]^2 + 

David Park
djmp at 

  • Prev by Date: Re: how to take quotation marks away ?
  • Next by Date: Re: PlotPoints in plot
  • Previous by thread: Re: Advection-Diffusion Equation with variable coefficients
  • Next by thread: Re: Simplifying Expressions with Ratios of Factors