Tuesday, 1 January 2013

Maximal subfield inside a central division algebra

I believe you are just asking if every central division algebra over F is a crossed product. This is not true, and the first example was given in:



Amitsur, S. A. "On central division algebras."
Israel J. Math. 12 (1972), 408-420.
MR 318216
DOI: 10.1007/BF02764632



A survey of Amitsur's contributions on division algebras which mentions this point in particular is the introduction by Saltman starting on page 109 of:



Amitsur, S. A. Selected papers of S. A. Amitsur with commentary. Part 2.
Edited by Avinoam Mann, Amitai Regev, Louis Rowen, David J. Saltman and Lance W. Small.
American Mathematical Society, Providence, RI, 2001. xx+615 pp. ISBN: 0-8218-2925-4
MR 1866637
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