What Conditions Make This Differential Operator Self-Adjoint?

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SUMMARY

The differential operator O defined as O:= ∑_{n=0}^4 f_n(x){d^n\over dx^n} is self-adjoint under specific constraints on the functions f_n and boundary conditions y(0)=y'(0)=y(1)=y'(1)=0. The discussion emphasizes the importance of understanding the definition of "self-adjoint" to determine the necessary conditions for the operator to maintain this property. Participants in the forum suggest analyzing the boundary conditions and the properties of the functions involved to derive the constraints required for self-adjointness.

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Homework Statement



When is the following operator self-adjoint? I am looking for constraints on [itex]f_n[/itex]'s s.t. The operator below becomes self-adjoint.

[itex]O:= \sum_{n=0}^4 f_n(x){d^n\over dx^n}[/itex] subjected to boundary conditions [itex]y(0)=y'(0)=y(1)=y'(1)=0[/itex] and where [itex]f_n[/itex]'s are real functions.

Thanks.

Homework Equations


See above.

The Attempt at a Solution


Totally clueless. Please help.
 
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Well, what is the definition of "self adjoint"? That would be a good place to start.
 

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