Department of Mathematics;
Payame Noor University;
PO Box 19395-3697 Tehran;
Iran;
Department of Mathematics;
National Technical University of Athens;
Zografou;
Campus 15780 Athens;
Greece;
Department of Mathematics;
Urmia University;
Urmia;
Iran;
希尔伯特; 稳定相; 广义; 模块; 函数方程; 柯西; Hilbert; 固定点;