Some easy to remember abstract forms of Ekeland's variational principle and Caristi's fixed point theorem
2007 ◽
Vol 1
(2)
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pp. 335-339
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1994 ◽
Vol 64
(1)
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pp. 119-125
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2017 ◽
Vol 158
(2)
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pp. 1-6
1991 ◽
Vol 7
(3)
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pp. 217-228
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1989 ◽
Vol 10
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pp. 119-121
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2002 ◽
Vol 31
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pp. 443-447
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2012 ◽
Vol 20
(1)
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pp. 101-112
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