2E6 (mathematics) - Wikipedia
https://en.wikipedia.org/wiki/2E6_(mathematics)
In mathematics, E6 is the name of a family of Steinberg or twisted Chevalley groups. It is a quasi-split form of E6, depending on a quadratic extension of fields K⊂L. Unfortunately the notation for the group is not standardized, as some authors write it as E6(K) (thinking of E6 as an algebraic
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