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The Akivis algebra of a homogeneous loop. (English) Zbl 0601.22002
The authors define an Akivis algebra to be a vector space equipped with an anticommutative bilinear operation [\(\cdot,\cdot]\) and a trilinear operation \(<\cdot,\cdot,\cdot >\) which measures how badly [\(\cdot,\cdot]\) fails to satisfy the Jacobi identity. The authors have shown in a previous work [Pac. J. Math. 123, 301-327 (1986; Zbl 0596.22002)] that Akivis algebras occur as the tangent algebras of analytic loops (i.e., non-associative groups).
In this paper they consider a Lie group G with Lie algebra L(G) and a closed subgroup H such that L(H) has a vector space complement K in L(G) with [L(H),K]\(\subseteq K\). (In this case the homogeneous space \(M=G/H\) is called reductive.) M admits the structure of a local loop by taking a local cross-section \(\sigma\) in a neighborhood of eH, and using it to transport the multiplication to a neighborhood of eH in M. The purpose of this paper is to calculate the Akivis algebra operations of the local Lie loop M in terms of the Lie algebra structure on L(G). It is shown that L(M) can be identified with K and that the Akivis algebra operations are given by \([X,Y]_ M=\pi_ K[X,Y]\) and \(<X,Y,Z>_ M=-(1/2)\) \([\pi_ H[X,Y],Z]\), where \(\pi_ K\) and \(\pi_ H\) are projections for L(G) onto K and L(H), respectively.
Reviewer: J.D.Lawson

MSC:
22A99 Topological and differentiable algebraic systems
17D99 Other nonassociative rings and algebras
17B99 Lie algebras and Lie superalgebras
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