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Published online by Cambridge University Press: 30 March 2012
Let 𝔉 be a saturated formation of soluble Leibniz algebras. Let K be an 𝔉-projector and A/B a chief factor of the soluble Leibniz algebra L. It is well known that if A/B is 𝔉-central, then K covers A/B. I prove the converse: if K covers A/B, then A/B is 𝔉-central.