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On the structure and representations of the insertion-elimination Lie algebra. (English) Zbl 1160.17018
Summary: We examine the structure of the insertion-elimination Lie algebra on rooted trees introduced in A. Connes and D. Kreimer [Ann. Henri Poincaré 3, No. 3, 411–433 (2002; Zbl 1033.81061)]. It possesses a triangular structure $${\mathfrak{g} = \mathfrak{n}_+ \oplus \mathbb{C}\cdot d \oplus \mathfrak{n}_-}$$, like the Heisenberg, Virasoro, and affine algebras. We show in particular that it is simple, which in turn implies that it has no finite-dimensional representations. We consider a category of lowest-weight representations, and show that irreducible representations are uniquely determined by a “lowest weight” $${\lambda \in \mathbb{C}}$$. We show that each irreducible representation is a quotient of a Verma-type object, which is generically irreducible.

##### MSC:
 17B65 Infinite-dimensional Lie (super)algebras 17B10 Representations of Lie algebras and Lie superalgebras, algebraic theory (weights) 17B66 Lie algebras of vector fields and related (super) algebras 17B81 Applications of Lie (super)algebras to physics, etc.
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##### References:
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