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The Freudenthal-Tits Magic Square  is a 4 × 4 array of groups associated with the Jordan algebras of 3 × 3 Hermitian matrices over R, C, Q, or O, complexified by (tensored with) R, C, Q, or O. That is, each group is associated with a pair of division algebras.
KeywordsDivision Algebra Clifford Algebra Jordan Algebra Hermitian Matrice Spinor Space
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