Hasse–Witt matrices for polynomials, and applications
Rendiconti del Seminario Matematico della Università di Padova, Tome 145 (2021), pp. 117-152.
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In a classical paper, Manin gives a congruence [15, Theorem 1] for the characteristic polynomial of the action of Frobenius on the Jacobian of a curve C, defined over the finite field 𝐅 q , q=p m , in terms of its Hasse–Witt matrix. The aim of this article is to prove a congruence similar to Manin’s one, valid for any L-function L(f,T) associated to the exponential sums over affine space attached to an additive character of 𝐅 q , and a polynomial f. In order to do this, we define a Hasse–Witt matrix HW (f), which depends on the characteristic p, the set D of exponents of f, and its coefficients. We also give some applications to the study of the Newton polygons of Artin–Schreier (hyperelliptic when p=2) curves, and zeta functions of varieties.

Publié le :
DOI : 10.4171/rsmup/74
Classification : 11, 14
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     author = {R\'egis Blache},
     title = {Hasse{\textendash}Witt matrices for polynomials, and applications},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {117--152},
     volume = {145},
     year = {2021},
     doi = {10.4171/rsmup/74},
     mrnumber = {4261649},
     zbl = {1479.11157},
     language = {en},
     url = {http://www.numdam.org/articles/10.4171/rsmup/74/}
}
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Régis Blache. Hasse–Witt matrices for polynomials, and applications. Rendiconti del Seminario Matematico della Università di Padova, Tome 145 (2021), pp. 117-152. doi : 10.4171/rsmup/74. http://www.numdam.org/articles/10.4171/rsmup/74/

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