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Fixed point method for set-valued functional equations. (English) Zbl 06817747
Summary: In this paper, we introduce a set-valued cubic functional equation and a set-valued quartic functional equation and prove the Hyers-Ulam stability of the set-valued cubic functional equation and the set-valued quartic functional equation by using the fixed point method.

##### MSC:
 47H10 Fixed-point theorems 54C60 Set-valued maps in general topology 39B52 Functional equations for functions with more general domains and/or ranges 47H04 Set-valued operators 91B44 Economics of information
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