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On the stability of functional equations on a square-symmetric groupoid. (English) Zbl 1224.39045
##### MSC:
 39B82 Stability, separation, extension, and related topics for functional equations 39B52 Functional equations for functions with more general domains and/or ranges 20L05 Groupoids (i.e. small categories in which all morphisms are isomorphisms)
##### Keywords:
functional equations; square-symmetric groupoid
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##### References:
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