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|Title:||Quadratic transformation of multivariate aggregation functions|
|Abstract:||© 2020 Prakassawat Boonmee et al., published by De Gruyter 2020. In this work, we prove that quadratic transformations of aggregation functions must come from quadratic aggregation functions. We also show that this is different from quadratic transformations of (multivariate) semi-copulas and quasi-copulas. In the latter case, those two classes are actually the same and consists of convex combinations of the identity map and another fixed quadratic transformation. In other words, it is a convex set with two extreme points. This result is different from the bivariate case in which the two classes are different and both are convex with four extreme points.|
|Appears in Collections:||CMUL: Journal Articles|
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