Knit products of graded Lie algebras and groups

Abstract

If a graded Lie algebra is the direct sum of two graded sub Lie algebras, its bracket can be written in a form that mimics a "double sided semidirect product". It is called the {\it knit product} of the two subalgebras then. The integrated version of this is called a {\it knit product} of groups --- it coincides with the {\it Zappa-Szép product}. The behavior of homomorphisms with respect to knit products is investigated.

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