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- W2896794224 abstract "We show how to use the combinatorial notion of jump sets to parametrize the possible structures of the group of principal units of local fields, viewed as filtered modules. We establish a natural bijection between the set of jump sets and the orbit space of a $p$-adic group of filtered automorphisms acting on a free filtered module. This, together with a Markov process on Eisenstein polynomials, culminates into a mass-formula for unit filtrations. As a bonus the proof leads in many cases to explicit invariants of Eisenstein polynomials, yielding a link between the filtered structure of the unit group and ramification theory. Finally, with the basic theory of filtered modules developed here, we recover, with a more conceptual proof, a classification, due to Miki, of the possible sets of upper jumps of a wild character: these are all jump sets, with a set of exceptions explicitly prescribed by the jump set of the local field and the size of its residue field." @default.
- W2896794224 created "2018-10-26" @default.
- W2896794224 creator A5007406156 @default.
- W2896794224 date "2018-10-23" @default.
- W2896794224 modified "2023-09-27" @default.
- W2896794224 title "Jump sets in local fields" @default.
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- W2896794224 hasPublicationYear "2018" @default.
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