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Fixed-point theorems for multi-valued functions and their applications to functional equations. (English) Zbl 0521.54034

54H25 Fixed-point and coincidence theorems (topological aspects)
54C60 Set-valued maps in general topology
39B52 Functional equations for functions with more general domains and/or ranges
39B62 Functional inequalities, including subadditivity, convexity, etc.
39B72 Systems of functional equations and inequalities