Why does the 2nd order homogeneous linear ODE have 2 general solutions?

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SUMMARY

The discussion clarifies that second-order linear homogeneous ordinary differential equations (ODEs) have exactly two linearly independent solutions due to the nature of their characteristic equations. The characteristic equation, derived from the ODE, yields two roots, which correspond to the two general solutions. This conclusion is established by the fundamental theorem of linear differential equations, confirming that the number of solutions is directly tied to the order of the ODE.

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  • Understanding of second-order linear homogeneous ordinary differential equations (ODEs)
  • Familiarity with characteristic equations and their derivation
  • Knowledge of linear independence in the context of differential equations
  • Basic concepts of solution spaces for differential equations
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Students and educators in mathematics, particularly those focusing on differential equations, as well as researchers interested in the theoretical foundations of ODEs.

kidsasd987
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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?
 
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is that because all 2nd order linear homogeneous ODEs can be solved by characteristic equation?

so the logic flow here is, 1. all 2nd order linear homogeneous ODES can be solved by characteristic eqs. 2. therefore we have 2 solutions.

not the reverse.
 

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