%0 Journal Article
%T SUFFICIENT AND NECESSARY CONDITIONS FOR DISCRETENESS OF SPECTRUM OF EULER DIFFERENTIAL OPERATORS<br>Euler微分算子谱是离散的充分必要条件
%A Zhong Wang
%A Jiong SUN
%A <br>王忠
%J 系统科学与数学
%D 2001
%I 
%X In this paper, the 2nd order symmetric Euler differential expressions with real-valued coefficients are considered. Some results concerning the discreteness of spectrum of Euler differential operators is obtained. Especially, the necessary and sufficient conditions are given which ensure that the spectrum of Euler differential operators is discrete.
%K Euler differential expression
%K differential operator
%K discrete spectrum
%K essential spectrum<br>Euler微分算式
%K 微分算子
%K 离散谱
%K 本质谱.
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=37F46C35E03B4B86&jid=0CD45CC5E994895A7F41A783D4235EC2&aid=6E56F3A0449109B4&yid=14E7EF987E4155E6&vid=659D3B06EBF534A7&iid=E158A972A605785F&sid=CEFA535D01173730&eid=60E9AACF61B3107F&journal_id=1000-0577&journal_name=系统科学与数学&referenced_num=0&reference_num=6