Jordan-von-Neumann-Wigner 1933: commutative non-associative product x.y=(xy+yx)/2; Jordan-identity (x^2.y).x = x^2.(y.x); 5 types incl exceptional Albert algebra.
Jordan-von-Neumann-Wigner 1933: commutative non-associative product x.y=(xy+yx)/2; Jordan-identity (x^2.y).x = x^2.(y.x); 5 types incl exceptional Albert algebra.