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A note on nonlinear mixed bi-skew Jordan and bi-skew Lie n-derivations on -algebras
AIMS Mathematics 2026, 11(6): 16936-16951
Published: 15 June 2026
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Let A be a unital -algebra with identity I . For A , B A , define the bi-skew Jordan product

A B = A B + B A

and the bi-skew Lie product

[ A , B ] = A B B A .

Suppose that a nonlinear mapping Φ : A A satisfies

Φ ( [ A 1 A 2 A n 1 , A n ] ) = j = 1 n [ A 1 A j 1 Φ ( A j ) A j + 1 A n 1 , A n ]

for all suitable elements A 1 , , A n A , where A 1 , A 2 { I , i I } and A j = I for every j = 3 , 4 , , n 2. We prove that Φ is an additive -derivation on A . As applications, several consequences are obtained for prime -algebras, factor von Neumann algebras, von Neumann algebras without central summands of type I 1 , and standard operator algebras. Moreover, a conjecture is proposed to motivate further research in this direction. The obtained results extend and generalize a recent result of Abbasi et al. [Non-additive mixed bi-skew Jordan and bi-skew Lie triple derivations on -algebras, Ricerche Mat., 2026.] concerning non-additive mixed bi-skew Jordan and bi-skew Lie triple derivations on -algebras.

Open Access Research Article Issue
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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