Classification of the four-dimensional power-commutative real division algebras

Details Classification of the four-dimensional power-commutative real division algebras Classification of the four-dimensional power-commutative real division algebras

2009-11-18

arxiv.org/abs/0911.3570v1

Mathematics

Rings and Algebras

16 pages

Scientific paper

A classification of all four-dimensional power-commutative real division algebras is given. It is shown that every four-dimensional power-commutative real division algebra is an isotope of a particular kind of a quadratic division algebra. The description of such isotopes in dimension four and eight is reduced to the description of quadratic division algebras. In dimension four this leads to a complete and irredundant classification. As a special case, the finite-dimensional power-commutative real division algebras that have a unique non-zero idempotent are characterised.

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