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2 votes
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Ramification at particular level of a tower of extensions of local field

Let $K$ be an unramified extension of the $p$-adic number field $\mathbb{Q}_p$. Suppose we have a tower of extensions: $$K=:K(u_0) \subset K(u_1) \subset K(u_2) \subset K(u_3) \subset \cdots \subset ...
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0 votes
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What is the action of the Galois group due to Lubin-Tate formal group on the respective Tate module?

It is a well-known fact that a Tate module $T_p(A)$ of an abelian group (abelian variety or commutative group scheme) $A$ over a field $K$, equipped with a continuous action of the respective absolute ...
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5 votes
0 answers
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defining the upper ramification numbering

Given a local field $K$ with absolute Galois group $\Gamma$. Is it "possible" to define the upper numbering on $\Gamma$ without using the lower numbering? In other words, given $\gamma \in \...
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  • 159