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Crossed morphisms, (integration of) post-Lie algebras and the post-Lie Magnus expansion (2006.10127v1)
Published 17 Jun 2020 in math.CO
Abstract: In the first part of this letter it will be shown that the post-Lie Magnus expansion can be interpreted as a crossed morphism between two (local) Lie group. The second part will be devoted to present two combinatorial methods, both based on special tubings on planar trees, to compute the coefficients of this remarkable formal series.
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