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why not the 2nd order linear homogeneous ODEs have three Linearly independent solutions or more? I know for the characteristic equation, we can only find 2 answers but.. just wondering if that is the only case to solve the question and if it is, then why it has to be.

so my question is,

1. 2nd order linear homogeneous ODE has 2 general solutions. but why?

2. derivation?

so my question is,

1. 2nd order linear homogeneous ODE has 2 general solutions. but why?

2. derivation?

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