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Bartoli, Daniele; Micheli, Giacomo; Zini, Giovanni; Zullo, Ferdinando
Journal of combinatorial theory. Series A, July 2022, 2022-07-00, Volume: 189Journal Article
r-fat polynomials are a natural generalization of scattered polynomials. They define linear sets of the projective line PG(1,qn) of rank n with r points of weight larger than one. Using techniques on algebraic curves and function fields, we obtain numerical bounds for r and the non-existence of exceptional r-fat polynomials with r>0. We completely determine the possible values of r when considering linearized polynomials over Fq4 and we also provide one family of 1-fat polynomials in PG(1,q5). Furthermore, we investigate LP-polynomials (i.e. polynomials of type f(x)=x+δxq2s∈Fqnx, gcd(n,s)=1), determining the spectrum of values r for which such polynomials are r-fat.
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