Abstract
Let [Formula: see text] be the Lie algebra of all n×n dominant block upper triangular matrices over a field 𝔽. In this paper, we explicitly describe all Lie triple derivations of [Formula: see text] when char(𝔽) ≠ 2. As an application, we characterize Lie derivations of [Formula: see text] when char(𝔽) ≠ 2.
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