Quasisymmetric functions from a topological point of view

Details Quasisymmetric functions from a topological point of view Quasisymmetric functions from a topological point of view

2006-05-30

arxiv.org/abs/math/0605743v4

Mathematics

Algebraic Topology

Slightly revised version; to appear in Mathematica Scandinavica

Scientific paper

It is well-known that the homology of the classifying space of the unitary group is isomorphic to the ring of symmetric functions, Symm. We offer the cohomology of the loop space of the suspension of the infinite complex projective space as a topological model for the ring of quasisymmetric functions, QSymm. We exploit standard results from topology to shed light on some of the algebraic properties of QSymm. In particular, we reprove the Ditters conjecture. We investigate a product on the loop space that gives rise to an algebraic structure which generalizes the Witt vector structure in the cohomology of BU. The canonical Thom spectrum over the loops on the suspension of BU(1) is highly non-commutative and we study some of its features, including the homology of its topological Hochschild homology spectrum.

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