A NECESSARY AND SUFFICIENT CONDITION FOR THE DISCRETENESS OF SPECTRUM OF 2n TH-ORDER SELF-ADJOINT DIFFERENTIAL OPERATORS
Zhong WANG
Journal of Systems Science and Mathematical Sciences ›› 2000, Vol. 20 ›› Issue (2) : 224-227.
A NECESSARY AND SUFFICIENT CONDITION FOR THE DISCRETENESS OF SPECTRUM OF 2n TH-ORDER SELF-ADJOINT DIFFERENTIAL OPERATORS
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