The Milnor–Moore theorem is a key result in the field of differential topology and algebraic topology, specifically concerning the structure of certain classes of smooth manifolds. Named after mathematicians John Milnor and John Moore, the theorem provides a characterization of the relationship between the algebra of smooth functions on a manifold and the algebra of its vector fields.
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For simply connected , rational Hurewicz homomorphism identifies with the primitive elements of a Hopf algebra of and induces an isomorphism of graded Hopf algebras. The bracket on homotopy is the Samelson product. The underlying algebra theorem says that a connected graded cocommutative Hopf algebra over characteristic zero is the universal enveloping algebra of its primitive Lie algebra. These statements let a free tensor algebra of loop-space homology detect a free graded Lie algebra of homotopy.