Mathematics – Rings and Algebras
Scientific paper
2010-07-09
Mathematics
Rings and Algebras
Scientific paper
We study not necessarily associative (NNA) division algebras over the reals. We classify those that admit a grading over a finite group $G$, and have a basis $\{v_g|g\in G\}$ as a real vector space, and the product of these basis elements respects the grading and includes a scalar structure constant with values in $\{1,-1\}$. That is, the algebra has a twisted product, and it is a twisted group algebra. We classify those graded by a group $G$ of order $|G|\leq 4$. We will find the complex, and quaternion algebras, but also a remarkable set of novel non--associative division algebras.
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