The Baker-Campbell-Hausdorff formula in the free metabelian Lie algebra
Abstract
The classical Baker-Campbell-Hausdorff formula gives a recursive way to compute the Hausdorff series H=ln(eX eY) for non-commuting X,Y. Formally H lives in the graded completion of the free Lie algebra L generated by X,Y. We present a closed explicit formula for H=ln(eX eY) in a linear basis of the graded completion of the free metabelian Lie algebra L/[[L,L],[L,L]].
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