%0 Journal Article
%T Product of two Orthogonal Projections in a Hilbert Space H<br>Hilbert空间上两个正交射影的乘积
%A Yao Xiyan
%A Du Hongke
%A <br>姚喜妍
%A 杜鸿科
%J 数学物理学报(A辑)
%D 2007
%I 
%X In this paper,structure of regular pairs of orthogonal projections are established. Moreover,a necessary and sufficient condition for an operator A to be able represented as a product of two orthogonal projections is given.
%K Orthogonal projection
%K Regular projection
%K Positive operator
%K Spectrum<br>正交射影
%K 正则射影
%K 正算子
%K 谱.
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=37F46C35E03B4B86&jid=4DB553CDB5F521D8C921082E5C95EC80&aid=45E56ED9809BC6FF6ED40696376620CD&yid=A732AF04DDA03BB3&vid=DB817633AA4F79B9&iid=E158A972A605785F&sid=A7379F6713A46835&eid=80BBC722D530DB8D&journal_id=1003-3998&journal_name=数学物理学报(A辑)&referenced_num=0&reference_num=6