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Nilpotent graphs of Lie superalgebras: structure and graph-theoretic properties
AIMS Mathematics 2025, 10(12): 28451-28469
Published: 03 December 2025
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We introduce the nilpotent graph Γ N ( L ) of a finite-dimensional Lie superalgebra L = L 0 ¯ L 1 ¯ over a field F , with vertices consisting of non-nilpotent elements and edges connecting pairs that generate nilpotent subsuperalgebras. We prove that the nilpotentizer N ( L ) coincides with the hypercenter Z ( L ) when char ( F ) = 0. For the triangular Lie superalgebra t ( 2 , F q ), we show that Γ N ( L ) is the disjoint union of q + 1 complete graphs K q ( q 1 ) , each having q ( q 1 ) vertices. We characterize the bipartiteness of Γ N ( L ), demonstrating that it is bipartite if and only if the odd component L 1 ¯ N ( L ). We also analyze connectivity, diameter, clique number, and chromatic number for Lie superalgebras such as s l ( 1 | 1 , F q ) and investigate direct sums and complement graphs. SageMath algorithms are provided to compute Γ N ( L ) and its invariants, linking the algebraic structure of Lie superalgebras to graph theory and emphasizing the role of Z 2 -grading in topological properties. Open problems on higher-dimensional structures and spectral properties are proposed.

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