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Computing Chevalley bases in small characteristics

Let L be the Lie algebra of a simple algebraic group defined over a field F and let H be a split Cartan subalgebra of L. Then L has a Chevalley basis with respect to H. If the characteristic of F is not 2 or 3, it is known how to find it. In this paper, we treat the remaining two characteristics. To this end, we present a few new methods, implemented in Magma, which vary from the computation of centralisers of one root space in another to the computation of a specific part of the Lie algebra of derivations of $L$.

preprint2009arXivOpen access
Arjeh M. CohenDan A. Roozemond
math.RA
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Arjeh M. CohenDan A. Roozemond

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