Schmid’s Formula for Higher Local Fields
Matthew Schmidt1
1 Department of Mathematics State University of New York Buffalo, NY 14260, USA
Journal de théorie des nombres de Bordeaux, Tome 32 (2020) no. 2, pp. 355-371.

In local class field theory, the Schmid–Witt symbol encodes interesting data about the ramification theory of p-extensi-ons of K and can, for example, be used to compute the higher ramification groups of such extensions. In 1936, Schmid discovered an explicit formula for the Schmid–Witt symbol of Artin–Schreier extensions of local fields. Later, his formula was generalized to Artin–Schreier–Witt extensions, but still over a local field. In this paper we generalize Schmid’s formula to compute the Artin–Schreier–Witt–Parshin symbol for Artin–Schreier–Witt extensions of two-dimensional local fields of positive characteristic.

En théorie du corps de classes local, le symbole de Schmid–Witt encode des données intéressantes sur la ramification des p-extensions de K et peut, par exemple, être utilisé pour calculer les groupes de ramification supérieurs de telles extensions. En 1936, Schmid a découvert une formule explicite pour le symbole de Schmid–Witt pour les extensions d’Artin–Schreier des corps locaux. Sa formule a été ensuite généralisée au cas des extensions d’Artin–Schreier–Witt, toujours pour les corps locaux. Dans cet article, nous généralisons la formule de Schmid pour calculer le symbole d’Artin–Schreier–Witt–Parshin pour les extensions d’Artin–Schreier–Witt des corps locaux de dimension 2 de caractéristique positive.

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DOI : 10.5802/jtnb.1125
Classification : 11R37, 11S15
Keywords: Artin–Schreier–Witt, Schmid–Witt, higher local field, ramification groups

Matthew Schmidt 1

1 Department of Mathematics State University of New York Buffalo, NY 14260, USA
Licence : CC-BY-ND 4.0
Droits d'auteur : Les auteurs conservent leurs droits 
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Matthew Schmidt. Schmid’s Formula for Higher Local Fields. Journal de théorie des nombres de Bordeaux, Tome 32 (2020) no. 2, pp. 355-371. doi : 10.5802/jtnb.1125. https://jtnb.centre-mersenne.org/articles/10.5802/jtnb.1125/

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