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arXiv · 2607.23378

Cohomological dimension of a Lie algebra homomorphism

Nursultan Kuanyshov
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Abstract

We introduce the notions of the cohomological dimension and the homological dimension of Lie algebra homomorphisms, extending the corresponding invariants for group homomorphisms. We establish their basic properties, including their behavior under monomorphisms, epimorphisms, pullbacks, composition, and restriction to the image. We also obtain a chain homotopy characterization of the cohomological dimension and compute these invariants explicitly for homomorphisms between free and abelian Lie algebras.

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Nursultan Kuanyshov. 2026-07-25. Cohomological dimension of a Lie algebra homomorphism. https://arxiv.org/abs/2607.23378

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