A Generalization of Caristi's Fixed Point Theorem and Its Applications
Received:August 25, 2004  
Key Words: fixed point theorem   Zorn's lemma   general principle on ordered set   variational principle.  
Fund Project:Tianyuan Young Mathematics of China under Grant (10526025) and Science Foundation of Nanjing Normal University under Grant(2002SXXXGQ2B20)
Author NameAffiliation
SUN Jin-li School of Mathematics and Computer Science, Nanjing Normal University, Jiangsu 210097, China 
SUN Jing-xian Department of Mathematics, Xuzhou Normal University, Jiangsu 221116, China 
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Abstract:
      The paper generalizes the classical Caristi's fixed point theorem. As an application, the classical Ekeland variational principle is generalized. In addition, it is proved that the generalized Caristi's fixed point theorem is equivalent to the generalized Ekeland variational principle.
Citation:
DOI:10.3770/j.issn:1000-341X.2006.02.002
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