%0 Journal Article %T Hopf-like Algebras and Extended P-B-W Theorems %A Keqin Liu %J Mathematics %D 2010 %I arXiv %X Based on invariant algebras, we introduce representations$^{6-th}$ of Lie algebras and representations$^{< 4-th>}$ of Leibniz algebras, give the extended P-B-W Theorems in the context of the new representations of Lie algebras and Leibniz algebras, and generalize the Hopf-algebra structure on the enveloping algebras of Lie Algebras. %U http://arxiv.org/abs/1012.2844v1