
The theorem on almost additive functions on semigroups by \textit{R. Ger} [ibid. 26, 219-228 (1979; Zbl 0444.39004); see also Ch. XVIII, \S 7 in the book of \textit{M. Kuczma}: An introduction to the theory of functional equations and inequalities. Cauchy's equation and Jensen's inequality (1985; Zbl 0555.39004)]is generalized to some substructures of an Ehresmann groupoid.
Functional equations for functions with more general domains and/or ranges, almost additive functions, Ehresmann groupoid, Groupoids (i.e. small categories in which all morphisms are isomorphisms), linearly invariant ideals, almost additivity
Functional equations for functions with more general domains and/or ranges, almost additive functions, Ehresmann groupoid, Groupoids (i.e. small categories in which all morphisms are isomorphisms), linearly invariant ideals, almost additivity
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