Are all fourth-order self-adjoint differential operators also Sturm Liouville?












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Suppose we have a fourth-order differential operator $L$ that we know is self-adjoint. Suppose also that the typical Sturmian boundary conditions are satisfied.



Is $L$ also Sturm Liouville? (This is true for second-order) That is, can it be put into Sturm Liouville form? If so, does this involve using integrating factors like the second-order analogue and/or is it tougher to do?










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  • $begingroup$
    I've never seen Sturm-Liouville refer to anything but second order self-adjoint.
    $endgroup$
    – DisintegratingByParts
    Jan 16 at 17:05
















0












$begingroup$


Suppose we have a fourth-order differential operator $L$ that we know is self-adjoint. Suppose also that the typical Sturmian boundary conditions are satisfied.



Is $L$ also Sturm Liouville? (This is true for second-order) That is, can it be put into Sturm Liouville form? If so, does this involve using integrating factors like the second-order analogue and/or is it tougher to do?










share|cite|improve this question









$endgroup$












  • $begingroup$
    I've never seen Sturm-Liouville refer to anything but second order self-adjoint.
    $endgroup$
    – DisintegratingByParts
    Jan 16 at 17:05














0












0








0





$begingroup$


Suppose we have a fourth-order differential operator $L$ that we know is self-adjoint. Suppose also that the typical Sturmian boundary conditions are satisfied.



Is $L$ also Sturm Liouville? (This is true for second-order) That is, can it be put into Sturm Liouville form? If so, does this involve using integrating factors like the second-order analogue and/or is it tougher to do?










share|cite|improve this question









$endgroup$




Suppose we have a fourth-order differential operator $L$ that we know is self-adjoint. Suppose also that the typical Sturmian boundary conditions are satisfied.



Is $L$ also Sturm Liouville? (This is true for second-order) That is, can it be put into Sturm Liouville form? If so, does this involve using integrating factors like the second-order analogue and/or is it tougher to do?







ordinary-differential-equations sturm-liouville






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share|cite|improve this question











share|cite|improve this question




share|cite|improve this question










asked Jan 16 at 1:55









K LK L

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436












  • $begingroup$
    I've never seen Sturm-Liouville refer to anything but second order self-adjoint.
    $endgroup$
    – DisintegratingByParts
    Jan 16 at 17:05


















  • $begingroup$
    I've never seen Sturm-Liouville refer to anything but second order self-adjoint.
    $endgroup$
    – DisintegratingByParts
    Jan 16 at 17:05
















$begingroup$
I've never seen Sturm-Liouville refer to anything but second order self-adjoint.
$endgroup$
– DisintegratingByParts
Jan 16 at 17:05




$begingroup$
I've never seen Sturm-Liouville refer to anything but second order self-adjoint.
$endgroup$
– DisintegratingByParts
Jan 16 at 17:05










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