MHB Can this method be applied to any ODE with a regular singular point at $x=0$?

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oasi said:
How can we solve this ODE with series

http://img841.imageshack.us/img841/8682/80858005.png

dwsmith said:
Start by letting $y=\sum\limits_{n=0}^{\infty}c_nx^n$ and taking the appropriate derivatives and plugging them into the DE.

Actually, since $x=0$ is a regular singular point of this DE, you're going to have to use the Method of Frobenius. Try
$$y=\sum_{n=0}^{\infty}c_{n}x^{n+r}.$$
 
I have the equation ##F^x=m\frac {d}{dt}(\gamma v^x)##, where ##\gamma## is the Lorentz factor, and ##x## is a superscript, not an exponent. In my textbook the solution is given as ##\frac {F^x}{m}t=\frac {v^x}{\sqrt {1-v^{x^2}/c^2}}##. What bothers me is, when I separate the variables I get ##\frac {F^x}{m}dt=d(\gamma v^x)##. Can I simply consider ##d(\gamma v^x)## the variable of integration without any further considerations? Can I simply make the substitution ##\gamma v^x = u## and then...

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