Mathematics – Number Theory
Scientific paper
2005-10-07
Amer. Math. Monthly 114 (2007), no. 7, 577--587
Mathematics
Number Theory
v2 (15 pages); followed Monthly style sheet and added additional exposition
Scientific paper
Hilbert's Theorem 90 is a classical result in the theory of cyclic extensions. The quadratic case of Hilbert 90, however, generalizes in noncyclic directions as well. Informed by a poem of Richard Wilbur, the article explores several generalizations, discerning connections among multiplicative groups of fields, values of binary quadratic forms, a bit of module theory over group rings, and even Galois cohomology.
Dwilewicz Roman
Minac Jan
Schultz Andrew
Swallow John
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