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Lie algebras are algebraic structures which were introduced to study the concept of infinitesimal transformations. The term "Lie algebra" (after Sophus Lie) was introduced by Hermann Weyl in the 1930s. In older texts, the name "infinitesimal group" is used. Related mathematical concepts include Lie groups and differentiable manifolds.

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On uniqueness of mapping preserving triality

I'm reading Baez, John C. (2002). "The Octonions". Bulletin of the American Mathematical Society 39 (2): 145–205 regarding $\mathrm{Spin}(8)$ and trialities. My question is about this sentence: Th …