SUFFICIENT AND NECESSARY CONDITIONS FOR THE DISCRETENESS OF SPECTRUM FOR A CLASS OF HIGH-ORDER DIFFERENTIAL OPERATORS
ZHOU Liguang, WANG Wanyi ,SUO Jianqing
Journal of Systems Science and Mathematical Sciences ›› 2013, Vol. 33 ›› Issue (3) : 373-382.
SUFFICIENT AND NECESSARY CONDITIONS FOR THE DISCRETENESS OF SPECTRUM FOR A CLASS OF HIGH-ORDER DIFFERENTIAL OPERATORS
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