On Intermediate Exceptional Series

Kimyeong Lee, Kaiwen Sun, Haowu Wang

The Freudenthal--Tits magic square $\mathfrak{m}({\mathbb{A}}_1,{\mathbb{A}}_2)$ for $\mathbb{A}=\mathbb{R},\mathbb{C},\mathbb{H},\mathbb{O}$ of semi-simple Lie algebras can be extende…