2010
DOI: 10.1515/crelle.2010.002
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On Katz's bound for the number of elements with given trace and norm

Abstract: In this note an improvement of the Katz's bound on the number of elements in a finite field with given trace and norm is given. The improvement is obtained by reducing the problem to estimating the number of rational points on certain toric Calabi-Yau hypersurface, and then to use detailed cohomological calculations by Rojas-Leon and the second author for such toric hypersurfaces.

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Cited by 2 publications
(3 citation statements)
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“…The Frobenius nonclassicality of cyclic coverings of P 1 (e.g. curve (19)) will be the focus of Section 5.…”
Section: Some Consequencesmentioning
confidence: 99%
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“…The Frobenius nonclassicality of cyclic coverings of P 1 (e.g. curve (19)) will be the focus of Section 5.…”
Section: Some Consequencesmentioning
confidence: 99%
“…Nicolas Katz [15] used deep results from algebraic geometry to set bounds for the number N k−1 (u, v). More recently, Moisio and Wan [19] used results on the zeta function of certain toric Calabi-Yau hypersurfaces to improve Katz's bound. Part of the motivation to determine N k−1 (u, v) is given by its known connections with many other problems (e.g.…”
mentioning
confidence: 99%
“…Se a = 0, o problema de determinar esses pontos é fácil. Caso contrário, a quantidade N ℓ (−a/b, ca/b 2 ) de elementos de F q ℓ com tal propriedade é limitada por Moisio-Wan em [28] como…”
Section: Arcos Associados a Curvas Frobenius Não-clássicasunclassified