Ahoy!
I'm trying to approximate f'(r) for the following equation using matched asymptotic expansions
-\frac{1}{2}\epsilon ff''=\left[\left(\epsilon+2r\right)f''\right]'
where \epsilon \ll 1 and with the boundary conditions f(0)=f'(0)=0, \quad f'(\infty)=1
The inner expansion which...