作者简介:LU Yu-feng(1962-),male,native of Changchun,Jlin,ssociate professor of Northeast Normal University, Ph.D.,engages in research in FunctionalAnalysis.
About author:LU Yu-feng(1962-),male,native of Changchun,Jlin,ssociate professor of Northeast Normal University, Ph.D.,engages in research in FunctionalAnalysis.