Semifields from skew polynomial rings

Details Semifields from skew polynomial rings Semifields from skew polynomial rings

2012-01-12

arxiv.org/abs/1201.2528v1

Mathematics

Rings and Algebras

Scientific paper

Skew polynomial rings were used to construct finite semifields by Petit in 1966, following from a construction of Ore and Jacobson of associative division algebras. In 1989 Jha and Johnson constructed the so-called cyclic semifields, obtained using irreducible semilinear transformations. In this work we show that these two constructions in fact lead to isotopic semifields, show how the skew polynomial construction can be used to calculate the nuclei more easily, and provide an upper bound for the number of isotopism classes, improving the bounds obtained by Kantor and Liebler in 2008 and implicitly in recent work by Dempwolff.

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