Geodesic
On the ramification theory of two-dimensional local fields
Sbornik. Mathematics, Tome 37 (1980) no. 3, pp. 349-365 Cet article a éte moissonné depuis la source Math-Net.Ru

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Filtrations are defined on the group $K_2^\operatorname{top}$ of a two-dimensional local field of characteristic $p>0$ and on the Galois group of its $p$-extension. Results are proved which are analogous to the one-dimensional case (Proposition 2.4, Theorem 2.1). It is proved that, for an Artin–Schreier extension $L/K$ the reciprocity map carries the filtration on the group $ K_2^{\operatorname{top}}(K)$ to the filtration on the group $ \operatorname{Gal}(L/K)$, with the Herbrand numbering. An example is given which shows that this is not true for an arbitrary $p$-extension. Bibliography: 7 titles. 
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V. G. Lomadze. On the ramification theory of two-dimensional local fields. Sbornik. Mathematics, Tome 37 (1980) no. 3, pp. 349-365. http://geodesic.mathdoc.fr/item/SM_1980_37_3_a3/

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