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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.NT2021
A new characterization of prime Fermat's numbers
Ahmed Bouzalmat, Ahmed Sani
We give a new sufficient condition which allows to test primality of Fermat's numbers. This characterization uses uniquely values at most equal to tested Fermat number. The robustn…