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Acta Arithmetica
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Universal normal bases for the abelian closure of the field of rational numbers

Authors: Hachenberger, Dirk;

Universal normal bases for the abelian closure of the field of rational numbers

Abstract

Let \(E/F\) be a finite Galois extension of fields. An element \(w\in E\) is called normal in \(E/F\) if \(w\) and its Galois conjugates form a basis for \(E\) as an \(F\)-vector space. Let \(\mathbb Q_n\) denote the \(n\)th cyclotomic field. An element \(w\in \mathbb Q_e\) is called universally normal in the extension \(\mathbb Q_e/\mathbb Q_d\) if \(w\) is normal for every intermediate cyclotomic extension \(\mathbb Q_e/\mathbb Q_n\), and it is called completely normal if \(w\) is normal for every intermediate extension \(\mathbb Q_e/K\). The author characterizes and explicitly constructs completely normal elements for \(\mathbb Q_{r^m}/\mathbb Q\), where \(r\) is an odd prime and where \(m\geq 1\). Universally normal elements are constructed and characterized for \(\mathbb Q_{2^m}/\mathbb Q\) for \(m\geq 2\). Finally, the author studies trace-compatible sequences of universally normal elements, namely sequences of elements \(w_n\in \mathbb Q_n\), with \(n\) varying, that are universally normal for \(\mathbb Q_n/\mathbb Q\) and such that, when \(d\) divides \(e\), the trace from \(\mathbb Q_e\) to \(\mathbb Q_d\) of \(w_e\) is \(w_d\).

Related Organizations
Keywords

ddc:510, Galois-Erweiterung, Basis <Mathematik>, Algebraic field extensions, Galois-Feld, Abschließung, Cyclotomic extensions, normal basis, Rationale Zahl, Kreiskörper, cyclotomic field

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
9
Average
Top 10%
Average
Green
bronze