On discreteness of spectrum of a second order differential operator
نویسندگان
چکیده
منابع مشابه
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ژورنال
عنوان ژورنال: Electronic Journal of Qualitative Theory of Differential Equations
سال: 2020
ISSN: 1417-3875
DOI: 10.14232/ejqtde.2020.1.52