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math.ST2021
New copulas and their applications to symmetrizations of bivariate copulas
Mohamed El Maazouz, Ahmed Sani
New copulas, based on perturbation theory, are introduced to clarify a \emph{symmetrization} procedure for asymmetric copulas. We give also some properties of the \emph{symmetrized…
math.ST2019
Copulas and Preserver Problems
Ahmed Sani, loubna Karbil
Preserver problems concern the characterization of operators on general spaces that leave invariant some categories of subsets or ratios. The most known in the mathematical literat…