Series solutions for differential equation

ktklam9
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Homework Statement



Use the power series to solve the following differential equations, state the first four terms of the two independent solutions.

3xy'' + y' - y = 0

Homework Equations



The power series.

The Attempt at a Solution



f1mpg0.png


How do I get two independent solutions out of this? All of my coefficients will depend on the first a...?
 
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Your differential equation is singular at x=0. There are two solutions but one of them is singular at x=0. Your power series solution will only pick up the nonsingular one.
 
Ah ok, so the problem is screwed up from the beginning, thanks :)
 
Search for the form of the series solution near a regular singular point.
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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