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Let . We find explicit conditions on a and b that are necessary and sufficient for f to be a permutation polynomial of . This result allows us to solve a related problem: Let (n ≥ 0, ) be the polynomial defined by the functional equation . We determine all n of the form , α > β ≥ 0, for which is a permutation polynomial of .
Le pgcd de quantités de la forme et a été étudié dans différentes situations. Dans la première partie de ce texte nous prouverons que si et appartiennent à , le pgcd en question peut être borné indépendamment de dans de nombreux cas. Ceci répond en particulier à une question de J. Silverman. Dans la deuxième partie nous étudierons un problème analogue dans la situation des modules de Drinfeld.
A left quasigroup of order that can be represented as a vector of Boolean functions of degree 2 is called a left multivariate quadratic quasigroup (LMQQ). For a given LMQQ there exists a left parastrophe operation defined by: that also defines a left multivariate quasigroup. However, in general, is not quadratic. Even more, representing it in a symbolic form may require exponential time and space. In this work we investigate the problem of finding a subclass of LMQQs whose left parastrophe...
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