Freudenthal 1951 + Tits 1966 4x4 array of Lie algebras built from R/C/H/O division algebras; explains exceptional E_6, E_7, E_8, F_4, G_2 in unified construction.
Freudenthal 1951 + Tits 1966 4x4 array of Lie algebras built from R/C/H/O division algebras; explains exceptional E_6, E_7, E_8, F_4, G_2 in unified construction.