### Abstract

We prove the following generalization of a classical result of Adams: for any pointed path-connected topological space (X, b), that is not necessarily simply connected, the cobar construction of the differential graded (dg) coalgebra of normalized singular chains in X with vertices at b is weakly equivalent as a differential graded associative algebra (dga) to the singular chains on the Moore based loop space of X at b. We deduce this statement from several more general categorical results of independent interest. We construct a functor (formula presented) from simplicial sets to categories enriched over cubical sets with connections, which, after triangulation of their mapping spaces, coincides with Lurie’s rigidification functor (formula presented) from simplicial sets to simplicial categories. Taking normalized chains of the mapping spaces of (formula presented) yields a functor ⋀ from simplicial sets to dg categories which is the left adjoint to the dg nerve functor. For any simplicial set S with (formula presented) is a dga isomorphic to ΩQ_{Δ}(S), the cobar construction on the dg coalgebra Q_{Δ}(S) of normalized chains on S. We use these facts to show that Q_{Δ} sends categorical equivalences between simplicial sets to maps of connected dg coalgebras which induce quasi-isomorphisms of dgas under the cobar functor, which is strictly stronger than saying the resulting dg coalgebras are quasi-isomorphic.

Original language | English (US) |
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Pages (from-to) | 3789-3820 |

Number of pages | 32 |

Journal | Algebraic and Geometric Topology |

Volume | 18 |

Issue number | 7 |

DOIs | |

State | Published - Dec 11 2018 |

### ASJC Scopus subject areas

- Geometry and Topology

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## Cite this

*Algebraic and Geometric Topology*,

*18*(7), 3789-3820. https://doi.org/10.2140/agt.2018.18.3789