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- W2953006431 abstract "We first prove that a graded, connected, free and cofree Hopf algebra is always self-dual; then that two graded, connected, free and cofree Hopf algebras are isomorphic if, and only if, they have the same Poincar'e-Hilbert formal series. If the characteristic of the base field is zero, we prove that the Lie algebra of the primitive elements of such an object is free, and we deduce a characterization of the formal series of free and cofree Hopf algebras by a condition of growth of the coefficients. We finally show that two graded, connected, free and cofree Hopf algebras are isomorphic as (non graded) Hopf algebras if, and only if, the Lie algebra of their primitive elements have the same number of generators." @default.
- W2953006431 created "2019-06-27" @default.
- W2953006431 creator A5064298910 @default.
- W2953006431 date "2010-10-26" @default.
- W2953006431 modified "2023-09-27" @default.
- W2953006431 title "Free and cofree Hopf algebras" @default.
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