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The Allison-Faulkner construction of $E_8$

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arxiv 2102.04261 v1 pith:HB5C534P submitted 2021-02-08 math.RA

classification math.RA
keywords constructiontitsallison-faulknerinvariantsalgebrascannotcohomologicalconstruct
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abstract

We show that the Tits index $E_8^{133}$ cannot be obtained by means of the Tits construction over a field with no odd degree extensions. We construct two cohomological invariants, in degrees 6 and 8, of the Tits construction and the more symmetric Allison-Faulkner construction of Lie algebras of type $E_8$ and show that these invariants can be used to detect the isotropy rank.

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