Infinite towers of Galois defect extensions of Kaplansky fields



Abstract

We give conditions for Kaplansky fields to admit infinite towers of Galois defect extensions of prime degree. As proofs of the presented facts are constructive, this provides examples of constructions of infinite towers of Galois defect extensions of prime degree. We also give a constructive proof of the fact that a henselian Kaplansky field cannot be defectless-by-finite.


Keywords

defect extensions; Kaplansky fields; Artin–Schreier defect extensions; Kummer defect extensions; defectless-by-finite fields

1. Blaszczok A., Infinite towers of Artin–Schreier defect extensions of rational function fields, in: A. Campillo, F.-V. Kuhlmann, B. Teissier (Eds.), Valuation theory in interaction, EMS Series of Congress Reports, European Mathematical Society (EMS), Zürich, 2014, pp. 16–54.
2. Blaszczok A., Distances of elements in valued field extensions, submitted.
3. Blaszczok, A., Kuhlmann F.-V., Algebraic independence of elements in immediate extensions of valued fields, J. Algebra 425 (2015), 179–214.
4. Blaszczok A., Kuhlmann F.-V., On maximal immediate extensions of valued fields, Math. Nachr. 290 (2017), 7–18.
5. Endler O., Valuation theory, Springer-Verlag, Berlin, 1972.
6. Kaplansky I., Maximal fields with valuations, Duke Math. J. 9 (1942), 303–321.
7. Karpilovsky G., Topics in field theory, North-Holland Mathematics Studies 155, North-Holland Publishing Co., Amsterdam, 1989.
8. Krull W., Allgemeine Bewertungstheorie, J. Reine Angew. Math. 167 (1932), 160–196.
9. Kuhlmann F.-V., Henselian function fields and tame fields, preprint (extended version of Ph.D. thesis), Heidelberg, 1990.
10. Kuhlmann F.-V., Valuation theoretic and model theoretic aspects of local uniformization, in: H. Hauser, J. Lipman, F. Oort, A. Quirós (Eds.), Resolution of singularities. A research textbook in tribute to Oscar Zariski, Progress in Mathematics 181, Birkhäuser Verlag, Basel, 2000, pp. 381–456.
11. Kuhlmann F.-V., Value groups, residue fields, and bad places of rational function fields, Trans. Amer. Math. Soc. 356 (2004), 4559–4600.
12. Kuhlmann F.-V., A classification of Artin–Schreier defect extensions and characterizations of defectless fields, Illinois J. Math. 54 (2010), 397–448.
13. Kuhlmann F.-V., The defect, in: M. Fontana, S.-E. Kabbaj, B. Olberding, I. Swanson (Eds.), Commutative algebra. Noetherian and non-Noetherian perspectives, Springer-Verlag, New York, 2011, pp. 277–318.
14. Kuhlmann F.-V., The algebra and model theory of tame valued fields, J. Reine Angew. Math. 719 (2016), 1–43.
15. Kuhlmann F.-V., Elimination of ramification II: henselian rationality of valued function fields, in preparation.
16. Whaples G., Galois cohomology of additive polynomial and n-th power mappings of fields, Duke Math. J. 24 (1957), 143–150.
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Published : 2018-01-31


BlaszczokA. (2018). Infinite towers of Galois defect extensions of Kaplansky fields. Annales Mathematicae Silesianae, 32, 65-78. Retrieved from https://journals.us.edu.pl/index.php/AMSIL/article/view/13913

Anna Blaszczok  anna.blaszczok@us.edu.pl
Instytut Matematyki, Uniwersytet Śląski w Katowicach  Poland



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