Navegando por Autor "Reis, Lucas"
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Item Generators of finite fields with prescribed traces.(2021) Reis, Lucas; Ribas, SávioThis paper explores the existence and distribution of primitive elements in finite field extensions with prescribed traces in several intermediate field extensions. Our main result provides an inequality-like condition to ensure the existence of such elements. We then derive concrete existence results for a special class of intermediate extensions.Item Permutations from an arithmetic setting.(2020) Reis, Lucas; Ribas, SávioLet m, n be positive integers such that m > 1 divides n. In this paper, we introduce a special class of piecewise-affine permutations of the finite set [1, n] := {1, . . . , n} with the property that the reduction (mod m) of m consecutive elements in any of its cycles is, up to a cyclic shift, a fixed permutation of [1, m]. Our main result provides the cycle decomposition of such permutations. We further show that such permutations give rise to permutations of finite fields. In particular, we explicitly obtain classes of permutation polynomials of finite fields whose cycle decomposition and its inverse are explicitly given.