The exceptional simple Lie algebras of types E7 and E8 are endowed with optimal $\mathsf{SL}_2^n$ -structures, and are thus described in terms of the corresponding coordinate algebras. These are nonassociative algebras which much resemble the so-called code algebras.

中文翻译：

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代码、S-结构和异常李代数

特殊的简单李代数类型乙7和乙8被赋予了最优的$\mathsf{SL}_2^n$-结构，因此用相应的坐标代数来描述。这些是非关联代数，非常类似于所谓的代码代数。