A Generalization of Ekeland’s Variational Principle
Fei HE School of Mathematical Sciences;Suzhou University;Suzhou 215006;P.R.China School of Mathematical Sciences;Inner Mongolia University;Hohhot 010021;P.R.China Jing Hui QIU School of Mathematical Sciences;Suzhou University;Suzhou 215006;P.R.China
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Spectra of Upper-Triangular Operator Matrices
Shi Fang ZHANG Department of Mathematics;Zhejiang University;Hangzhou 310027;P.R.China; School of Mathematics and Computer Science;Fujian Normal University; Fuzhou 350007;P.R.China; Huai Jie ZHONG School of Mathematics and Computer Science;Fujian Normal University; Fuzhou 350007;P.R.China Jun De WU Department of Mathematics;Zhejiang University;Hangzhou 310027;P.R.China
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Landau’s Theorems for Certain Biharmonic Mappings
Ming Sheng LIU Zhi Wen LIU School of Mathematical Sciences;South China Normal University; Guangzhou 510631;P.R.China Yu Can ZHU Department of Mathematics;Fuzhou University;Fuzhou 350108;P.R.China
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