
A local Jordan algebra J \mathfrak {J} is a unital quadratic Jordan algebra in which Rad J \operatorname {Rad} \mathfrak {J} is a maximal ideal, J / Rad J \mathfrak {J}/\operatorname {Rad} \mathfrak {J} satisfies the DCC, and ∩ k Rad J ( k ) = 0 { \cap _k}\operatorname {Rad} {\mathfrak {J}^{(k)}} = 0 where K ( n + 1 ) = U K ( n ) K ( n ) {K^{(n + 1)}} = {U_K}(n){K^{(n)}} . We show that the completion of a local Jordan algebra is also local Jordan, and if J \mathfrak {J} is a complete local Jordan algebra over a field of characteristic not 2, then either (1) J \mathfrak {J} is a complete completely primary Jordan algebra, (2) J ≅ J 1 ⊕ J 2 ⊕ S \mathfrak {J} \cong {\mathfrak {J}_1} \oplus {\mathfrak {J}_2} \oplus S where each J i {\mathfrak {J}_i} is a completely primary local Jordan algebra, or (3) J ≅ H ( D n , J a ) \mathfrak {J} \cong \mathfrak {H}({D_n},{J_a}) where ( D , j ) (D,j) is either a not associative alternative algebra with involution or a complete semilocal associative algebra with involution.
unital quadratic Jordan algebra, Structure theory for Jordan algebras, Noncommutative local and semilocal rings, perfect rings, Jordan algebras (algebras, triples and pairs)
unital quadratic Jordan algebra, Structure theory for Jordan algebras, Noncommutative local and semilocal rings, perfect rings, Jordan algebras (algebras, triples and pairs)
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