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We introduce the dendroidal analogs of the notions of complete Segal space and of Segal category, and construct two appropriate model categories for which each of these notions corresponds to the property of being fibrant. We prove that…

Category Theory · Mathematics 2013-03-26 Denis-Charles Cisinski , Ieke Moerdijk

We introduce a new model structure on the category of dendroidal spaces, designed to provide a further model for the homotopy theory of $\infty$-operads. This model is directly analogous to a recent construction on the category of…

Algebraic Topology · Mathematics 2026-01-15 João Candeias , Javier J. Gutiérrez

We construct a monoidal version of Lurie's un/straightening equivalence. In more detail, for any symmetric monoidal $\infty$-category $\mathbf C$, we endow the $\infty$-category of coCartesian fibrations over $\mathbf C$ with a (naturally…

Category Theory · Mathematics 2026-02-10 Maxime Ramzi

We develop a notion of an algebra over an infinity-operad with values in infinity-categories which is completely intrinsic to the formalism of dendroidal sets. Its definition involves the notion of a coCartesian fibration of dendroidal sets…

Algebraic Topology · Mathematics 2011-12-06 Gijs Heuts

We show how to treat families of $\infty$-categories fibered in categorical patterns (e.g., $\infty$-operads and monoidal $\infty$-categories) in terms of fibrations by relativizing the Grothendieck construction. As applications, we…

Category Theory · Mathematics 2024-04-02 Kensuke Arakawa

The Grothendieck construction is a classical correspondence between diagrams of categories and coCartesian fibrations over the indexing category. In this paper we consider the analogous correspondence in the setting of model categories. As…

Algebraic Topology · Mathematics 2015-06-15 Yonatan Harpaz , Matan Prasma

We discuss a variant of the category of dendroidal sets, the so-called closed dendroidal sets which are indexed by trees without leaves. This category carries a Quillen model structure which behaves better than the one on general dendroidal…

Algebraic Topology · Mathematics 2018-11-15 Ieke Moerdijk

The homotopy theory of infinity-operads is defined by extending Joyal's homotopy theory of infinity-categories to the category of dendroidal sets. We prove that the category of dendroidal sets is endowed with a model category structure…

Category Theory · Mathematics 2014-03-27 Denis-Charles Cisinski , Ieke Moerdijk

We lift the standard equivalence between fibrations and indexed categories to an equivalence between monoidal fibrations and monoidal indexed categories, namely weak monoidal pseudofunctors to the 2-category of categories. In doing so, we…

Category Theory · Mathematics 2021-08-19 Joe Moeller , Christina Vasilakopoulou

Given an operad $\mathcal{O}$, we define a notion of weak $\mathcal{O}$-monoids -- which we term $\mathcal{O}$-pseudomonoids -- in a 2-category. In the special case with the 2-category in question is the 2-category $\mathsf{Cat}$ of…

Category Theory · Mathematics 2024-04-02 Redi Haderi , Walker H. Stern

We introduce the concept of a dendroidal set. This is a generalization of the notion of a simplicial set, specially suited to the study of operads in the context of homotopy theory. We define a category of trees, which extends the category…

Algebraic Topology · Mathematics 2014-10-01 Ieke Moerdijk , Ittay Weiss

We establish a Quillen equivalence relating the homotopy theory of Segal operads and the homotopy theory of simplicial operads, from which we deduce that the homotopy coherent nerve functor is a right Quillen equivalence from the model…

Algebraic Topology · Mathematics 2014-02-26 Denis-Charles Cisinski , Ieke Moerdijk

In this thesis, we present a flexible framework for specifying and constructing operads which are suited to reasoning about network construction. The data used to present these operads is called a \emph{network model}, a monoidal variant of…

Category Theory · Mathematics 2021-01-20 Joe Moeller

We develop a basic theory of cocartesian fibrations between Segal spaces (in line with that of arxiv:2102.05190), and use it to provide a proof of a theorem of Barwick (the main result of arxiv:1404.0108). Note: This work was originally the…

Algebraic Topology · Mathematics 2022-09-23 Angus Hadrian Rush

We discuss right fibrations in the $\infty$-categorical context of Segal objects in a category V and prove some basic results about these.

Algebraic Topology · Mathematics 2017-11-28 Pedro Boavida de Brito

The purpose of this short note is to illustrate the utility of (semi-) dendroidal objects in describing certain 'up-to-homotopy' operads. Specifically, we exhibit a semi-dendroidal space satisfying the Segal condition, whose evaluation at a…

Algebraic Topology · Mathematics 2020-07-03 Philip Hackney

We provide details of the proof of Lurie's theorem on operadic Kan extensions. Along the way, we generalize the construction of monoidal envelopes of $\infty$-operads to families of $\infty$-operads and use it to construct the fiberwise…

Category Theory · Mathematics 2025-07-22 Kensuke Arakawa

We prove that the category of trees $\Omega$ is a test category in the sense of Grothendieck. This implies that the category of dendroidal sets is endowed with the structure of a model category Quillen-equivalent to spaces. We show that…

Algebraic Topology · Mathematics 2020-09-09 Dimitri Ara , Denis-Charles Cisinski , Ieke Moerdijk

The straightening-unstraightening correspondence of Grothendieck--Lurie provides an equivalence between cocartesian fibrations between $(\infty, 1)$-categories and diagrams of $(\infty, 1)$-categories. We provide an alternative proof of…

Category Theory · Mathematics 2023-09-06 Joost Nuiten

In this paper, we construct a model structure for $(\infty,1)$-categories on the category of simplicial spaces, whose fibrant objects are the Segal spaces. In particular, we show that it is Quillen equivalent to the models of…

Algebraic Topology · Mathematics 2025-12-01 Lyne Moser , Joost Nuiten
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