Abstract
For each fixed complex matrix M, the solution space to the matrix equation XM + MXT = 0 is a Lie algebra denoted by \(\mathfrak{g}(n,M,\mathbb{C})\). We study the basic structure of \(\mathfrak{g}(n,M,\mathbb{C})\) when M are the canonical matrices for congruence, i.e. M = Jn(0), Γn,H2n(λ). We show that \(\mathfrak{g}(n,J_{n}(0),\mathbb{C})\) (n even) and \(\mathfrak{g}(n,\Gamma_{n},\mathbb{C})\) are abelian Lie algebras; and \(\mathfrak{g}(n,J_{n}(0),\mathbb{C})\) (n > 1 odd) is a non-nilpotent solvable Lie algebra. For \(\mathfrak{g}(2n,H_{2n}(\lambda),\mathbb{C})\), we determine its basis, radical and Levi subalgebra, and show that its radical is nilpotent.
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Zhao, Z., Wang, X. On the Lie Algebra Associated to the Canonical Matrices. Front. Math (2024). https://doi.org/10.1007/s11464-023-0112-z
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DOI: https://doi.org/10.1007/s11464-023-0112-z