Mathematics – Functional Analysis
Scientific paper
2010-07-05
Fuzzy Sets and Systems 181 (1) (2011) 28-38
Mathematics
Functional Analysis
Scientific paper
10.1016/j.fss.2011.05.006
Three important properties in aggregation theory are investigated, namely horizontal min-additivity, horizontal max-additivity, and comonotonic additivity, which are defined by certain relaxations of the Cauchy functional equation in several variables. We show that these properties are equivalent and we completely describe the functions characterized by them. By adding some regularity conditions, these functions coincide with the Lov\'asz extensions vanishing at the origin, which subsume the discrete Choquet integrals. We also propose a simultaneous generalization of horizontal min-additivity and horizontal max-additivity, called horizontal median-additivity, and we describe the corresponding function class. Additional conditions then reduce this class to that of symmetric Lov\'asz extensions, which includes the discrete symmetric Choquet integrals.
Couceiro Miguel
Marichal Jean-Luc
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