Athematica seems to be asking for more arguments

[kel]

Homework Statement

I'm fairly new to mathematica and have been trying to input the following equation, but keep getting an error message stating that I have only 2 arguments when I need 3 or more.

BTW, this is in relation to astrophysics

Homework Equations

function is:

f(x) = (1 / x^2) d / dx ((x^2) (df^(E-1) / dx))

where ϵ=5/3
and f(0) = 1

The Attempt at a Solution

I've put it into mathematica as

DSolve[{f[x] == ((1/x^2))* (d/dx) (x^2 * df^(ϵ - 1)/dx), x[0] == 1} f[x], x]

I've had do tidy this up a bit as when cutting & pasting mathematica seems to add extra brackets etc.

As I've stated, mathematica seems to be asking for more arguments, but I don't know what else I can add to the equation.

Thanks

 

[chroot]

Mathematica does not understand the symbol (d/dx). You need to use the D[] operator to perform differentiation.

- Warren

 

[kel]

so, I should differentiate the inner bracket first and then add the answer to this in a second differentiation??