On the Closed Subfields ofCp
โ Scribed by Victor Alexandru; Nicolae Popescu; Alexandru Zaharescu
- Book ID
- 102602545
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 442 KB
- Volume
- 68
- Category
- Article
- ISSN
- 0022-314X
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โฆ Synopsis
The so called ``p-adic analog of the field of complex numbers'' C p (see [6,7,21]) seems to be a very interesting object to study, both from an algebraic and an analytic point of view. Particularly interesting are its closed subfields. A first account on them can be find in [7] (see also [14] and especially [21]).
Here we try to give some new aspects and results on the elements of C p which are transcendental over Q p . These elements will be called simply ``transcendental''.
Our paper has six sections. In the first section we recall basic results, definitions and notations. In the second one we define ``distinguished sequences'' and prove that they permit to construct transcendental elements and also to associate to any transcendental element an infinite set of numerical invariants. Although the invariants of a given transcendental element do not define it uniquely, they tell much about it.
In Section 3 we consider the conjugate class (or orbit) of a transcendental element. This orbit is compact and totally disconnected. In Theorem 3.7 we give an analytic criterion to determine the conjugates of a transcendental element.
In Section 4 we deal with the so-called generic transcendental elements. Let K be a closed subfield of C p , infinite over Q p . According to [13], there exists a generic transcendental element t of K, i.e. such that K is the topological closure of Q p (t). Starting with a distinguished sequence [: n ] n which defines t we can describe the action of v on K, the residue field and value group of K and the algebraic closure of Q p in K (Theorems 4.1 and 4.2).
In Section 5 we introduce a particular kind of generic transcendental elements. Although Theorem 5.4 gives a criterion for two such elements to Article No. NT972198
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