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math-ph2004★ 3 cited
Spinors and Octonions
Luis J. Boya
Octonions are introduced through some spin representations. The groups , and the series appear in a natural manner; one way to understand octonions is as the "second…
math-ph2003
Obstructions, Extensions and Reductions. Some applications of Cohomology
Luis J. Boya
After introducing some cohomology classes as obstructions to orientation and spin structures etc., we explain some applications of cohomology to physical problems, in special to re…