q-pre-Lie algebras unify pre-Lie and anti-pre-Lie; graded ones on Witt are classified by a single parameter λ, none exist on Virasoro (q≠1), and only sl2 among simple Lie algebras admits root-graded examples (q=2 or -1).
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On $q$-pre-Lie algebras
q-pre-Lie algebras unify pre-Lie and anti-pre-Lie; graded ones on Witt are classified by a single parameter λ, none exist on Virasoro (q≠1), and only sl2 among simple Lie algebras admits root-graded examples (q=2 or -1).