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AdrianZ
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Homework Statement
Suppose that we have the following linear ODE:
[tex]y^{(n)} + a_{n-1}y^{(n-1)} + a_{n+2}y^{(n-2)} + ... + a_2y'' + a_1y' + a_0y = 0[/tex]
Prove that if we have (n-1) linearly independent {y1,...,yn-1} solutions then we can find yn.
The Attempt at a Solution
well, this is my idea:
Imagine that C(a,b) is the linear space of all the functions that are continuous in the interval [a,b]. Let's define an inner product on this space as the following:
<f,g> = ∫abf(x)g(x)dx
Now, Imagine I have n-1 linearly independent functions y1,...,yn-1 then the problem is transformed into finding a function yn such that yn is perpendicular to all the other yi's (i=1,...,n-1).
well, it means I should show that there exists a function that for any yi I have:
∫abynyidx
Here is where I'm stuck. What should I do?
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