Change of function in an ODE

*To*: mathgroup at smc.vnet.net*Subject*: [mg109043] Change of function in an ODE*From*: Sam Takoy <sam.takoy at yahoo.com>*Date*: Sun, 11 Apr 2010 04:32:53 -0400 (EDT)

Hi, I'm solving DSolve[r^4 R''''[r] + 2 r^3 R'''[r] - r^2 R''[r] + r R'[r] - L^4 r^4 R[r] == 0, R[r], r] // Simplify Now, I would like to make the substitution R[r]=r^2 Log[r] G[r], formulate the equation for G[r] and solve it. What's the proper syntax for that? Thanks, Sam