Partially ordered groups with two disjoint elements
J. Jakubík (1970)
Colloquium Mathematicae
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J. Jakubík (1970)
Colloquium Mathematicae
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Ján Jakubík (1990)
Czechoslovak Mathematical Journal
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Štefan Černák (1995)
Mathematica Slovaca
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Ján Jakubík (1989)
Archivum Mathematicum
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Bupurao C. Dhage (2006)
Discussiones Mathematicae, Differential Inclusions, Control and Optimization
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In this paper, some algebraic fixed point theorems for multi-valued discontinuous operators on ordered spaces are proved. These theorems improve the earlier fixed point theorems of Dhage (1988, 1991) Dhage and Regan (2002) and Heikkilä and Hu (1993) under weaker conditions. The main fixed point theorems are applied to the first order discontinuous differential inclusions for proving the existence of the solutions under certain monotonicity condition of multi-functions.