David Blanc, Nicholas Meadows
We explain how to set up the homotopy spectral sequence of a (co)simplicial object in an $\infty$-category, with an emphasis on how to construct the differentials in a model-invariant manner.
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The aim of this paper is to present a simplified version of the notion of $\infty$-groupoid developed by Grothendieck in "Pursuing Stacks" and to introduce a definition of $\infty$-categories inspired by Grothendieck's approach.
A simple model for twisted arrow $\infty$-categories
本文提出一个简单模型用于 $(\infty,2)$-范畴的扭曲箭 $\infty$-范畴，扩展了 Lurie 的原始工作。
We study the *homotopy theory* of $\infty$-categories enriched in the $\infty$-category $sS$ of simplicial spaces. That is, we consider $sS$-enriched $\infty$-categories as presentations of ordinary $\infty$-categories by means of a "local" geometric realization functor $Cat_{sS} \to Cat_\infty$, and we prove that their homotopy theory presents the $\infty$-category of $\infty$-categories, i.e. that this functor induces an equivalence $Cat_{sS} [[ W_{DK}^{-1} ]] \xrightarrow{\sim} Cat_\infty$ from a localization of the $\infty$-category of $sS$-enriched $\infty$-categories. Following Dwyer--Ka…
In this paper we introduce a notion of $\mathbf{O}$-monoidal $\infty$-categories for a finite sequence $\mathbf{O}^{\otimes}$ of $\infty$-operads, which is a generalization of the notion of higher monoidal categories in the setting of $\infty$-categories. We show that the $\infty$-category of coCartesian $\mathbf{O}$-monoidal $\infty$-categories and right adjoint lax $\mathbf{O}$-monoidal functors is equivalent to the opposite of the $\infty$-category of Cartesian $\mathbf{O}_{\rm rev}$-monoidal $\infty$-categories and left adjoint oplax $\mathbf{O}_{\rm rev}$-monoidal functors, where $\mathbf…
The goal of this paper is to prove an equivalence between the $(\infty,2)$-category of cartesian factorization systems of $\infty$-categories and that of pointed cartesian fibrations of $\infty$-categories. This generalizes a similar result known for ordinary categories and sheds some light on the interplay between these two seemingly distant concepts.
We set up a general theory of weak or homotopy-coherent enrichment in an arbitrary monoidal $\infty$-category $\mathcal{V}$. Our theory of enriched $\infty$-categories has many desirable properties; for instance, if the enriching $\infty$-category $\mathcal{V}$ is presentably symmetric monoidal then $\mathrm{Cat}^\mathcal{V}_\infty$ is as well. These features render the theory useful even when an $\infty$-category of enriched $\infty$-categories comes from a model category (as is often the case in examples of interest, e.g. dg-categories, spectral categories, and $(\infty,n)$-categories). This…
In this short note we prove that two definitions of (co)ends in $\infty$-categories, via twisted arrow $\infty$-categories and via $\infty$-categories of simplices, are equivalent. We also show that weighted (co)limits, which can be defined as certain (co)ends, can alternatively be described as (co)limits over left and right fibrations, respectively.
Factorization Systems on $\infty$-Categories: Un/Straightening and Monadicity
该研究证明了∞-范畴上分解系统的两个结构性结果：一是对一类∞-范畴纤维化全空间的分解系统分类，二是相关遗忘函子为单子右伴随，丰富了∞-范畴的结构理论。
Cores and localizations of $(\infty,\infty)$-categories
本文研究了$(\infty,\infty)$-范畴在极限情况下的核与局部化，探讨了其作为反射局部化的关系及中间局部化的性质。
We use Lurie's symmetric monoidal envelope functor to give two new descriptions of $\infty$-operads: as certain symmetric monoidal $\infty$-categories whose underlying symmetric monoidal $\infty$-groupoids are free, and as certain symmetric monoidal $\infty$-categories equipped with a symmetric monoidal functor to finite sets (with disjoint union as tensor product). The latter leads to a third description of $\infty$-operads, as a localization of a presheaf $\infty$-category, and we use this to give a simple proof of the equivalence between Lurie's and Barwick's models for $\infty$-operads.
The Grothendieck Construction for $\infty$-Categories Fibered over Categorical Patterns
本文通过相对化Grothendieck构造，为纤维化于范畴模式中的∞-范畴族建立纤维化处理框架，并构造万有共笛卡尔纤维化的类比，给出极限与余极限的计算方法。
While many different models for $(\infty,1)$-categories are currently being used, it is known that they are Quillen equivalent to one another. Several higher-order analogues of them are being developed as models for $(\infty, n)$-categories. In this paper, we establish model structures for some naturally arising categories of objects which should be thought of as $(\infty,n)$-categories. Furthermore, we establish Quillen equivalences between them.
On duoidal $\infty$-categories
本文在$\infty$-范畴框架下引入双幺半$\infty$-范畴，定义三类函子及相应的三种范畴表述，并据此定义双幺半群等结构。
Models for rational $(\infty, 1)$-categories
本研究引入有理$(\infty, 1)$-范畴的概念，提出有理完全Segal空间与有理Segal范畴两种模型，并证明二者等价，为有理高阶同伦理论提供新的范畴化模型框架。
We introduce a notion of bimodule in the setting of enriched $\infty$-categories, and use this to construct a double $\infty$-category of enriched $\infty$-categories where the two kinds of 1-morphisms are functors and bimodules. We then consider a natural definition of natural transformations in this context, and show that in the underlying $(\infty,2)$-category of enriched $\infty$-categories with functors as 1-morphisms the 2-morphisms are given by natural transformations.
On bi-enriched $\infty$-categories
本文将Lurie的富集$\infty$-范畴推广为左富集、右富集和双富集$\infty$-范畴，并利用双富集结构研究富集函子范畴、富集Kan扩张及相关end/coend公式，发展了独立的富集$\infty$-范畴理论。
A theorem of Retakh for exact $\infty$-categories and higher extension functors
该研究针对正合∞范畴，通过双纤维化定义扩张∞范畴，证明其稳定包络不变且构成Ω谱以推广Retakh定理，还验证了其同伦群与对应外三角范畴的高阶扩张群自然同构。
The Gray tensor product of $(\infty,n)$-categories
本文基于粘贴定理构造了$(\infty,n)$-范畴的新模型，并借助Day卷积与反射实现了其Gray张量积，进而用不依赖模型的泛性质加以刻画。
Enriched $\infty$-categories as marked module categories
本研究证明富化$\u221e$-范畴可由带可表预层标记的富化预层范畴完全刻画，建立了其与带$\u221e$-群胚函子的可展示$\u2113$-模范畴满子范畴的等价，借此构造新的富化$\u221e$-范畴张量积并重新表述单值性概念。
Homotopy Posets, Postnikov Towers, and Hypercompletions of $\infty$-Categories
研究同伦格在∞-范畴中的扩展，揭示其作为纤维化长正合序列的层次，并探讨Postnikov塔的收敛性及超完备∞-范畴的构造。
We show that the homotopy theory of strict 2-categories embeds in that of $(\infty,2)$-categories in the form of 2-precomplicial sets. More precisely, we construct a nerve-categorification adjunction that is a Quillen pair between Lack's model structure for 2-categories and Riehl-Verity's model structure for 2-complicial sets. Furthermore, we show that Lack's model structure is transferred along this nerve and that the nerve is homotopically fully faithful.
In this paper we give a summary of the comparisons between different definitions of so-called (\infty,1)-categories, which are considered to be models for \infty-categories whose n-morphisms are all invertible for n>1. They are also, from the viewpoint of homotopy theory, models for the homotopy theory of homotopy theories. The four different structures, all of which are equivalent, are simplicial categories, Segal categories, complete Segal spaces, and quasi-categories.
We prove that various structures on model $\infty$-categories descend to corresponding structures on their localizations: (i) Quillen adjunctions; (ii) two-variable Quillen adjunctions; (iii) monoidal and symmetric monoidal model structures; and (iv) enriched model structures.
This paper is the second in a series of two papers about generalizing Quillen's Theorem A to strict $\infty$-categories. In the first one, we presented a proof of this Theorem A of a simplicial nature, direct but somewhat ad hoc. In the current paper, we give a conceptual proof of an $\infty$-categorical nature of the same theorem. This proof is based on the theory of join and slices for strict $\infty$-categories developed by the authors in a previous paper, and on a comma construction for strict $\infty$-categories generalizing classical comma categories and Gray's comma 2-categories. This $…
An example of the non-existence of coequalizers in the category of the A$_{\infty}$-categories
本文证明严格单位与非单位的A∞-代数及A∞-范畴范畴在相应态射下均无余等化子，给出反例。
Goerss--Hopkins obstruction theory is a powerful tool for constructing structured ring spectra from purely algebraic data. Using the formalism of model $\infty$-categories, we provide a generalization that applies in an arbitrary presentably symmetric monoidal stable $\infty$-category (such as that of equivariant spectra or of motivic spectra).
An equivalence between enriched $\infty$-categories and $\infty$-categories with weak action
该研究证明Lurie与Gepner-Haugseng两种意义下的$\u2118$-富化∞-范畴等价，建立了对应松弛幺半函子限制关系，并给出稳定∞-范畴嵌入与富化Yoneda嵌入两项应用。
We prove the existence of Morita model structures on the categories of small simplicial categories, simplicial sets, simplicial operads and dendroidal sets, modelling the Morita homotopy theory of $(\infty,1)$-categories and $\infty$-operads. We give a characterization of the weak equivalences in terms of simplicial presheaves, simplicial algebras and slice categories. In the case of the Morita model structure for simplicial categories and simplicial operads, we also show that each of these model structures can be obtained as an explicit left Bousfield localization of the Bergner model structu…
We prove the compatibility between the suspension construction and the complicial nerve of $ω$-categories. As a motivating application, we produce a Quillen pair between the models of $(\infty,n)$-categories given by Rezk's complete Segal $Θ_n$-spaces and Verity's $n$-complicial sets.
We define for each $n \geq 1$ a symmetric monoidal $(\infty, n+1)$-category $n\mathrm{Pr}^L$ whose objects we call presentable $(\infty,n)$-categories, generalizing the usual theory of presentable $(\infty,1)$-categories. We show that each object $\mathcal{C}$ in $n\mathrm{Pr}^L$ has an underlying $(\infty,n)$-category $ψ_n(\mathcal{C})$ which admits all conical colimits, and that conical colimits of right adjointable diagrams in $ψ_n(\mathcal{C})$ can be computed in terms of conical limits after passage to right adjoints.
We use the basic expected properties of the Gray tensor product of $(\infty,2)$-categories to study (co)lax natural transformations. Using results of Riehl-Verity and Zaganidis we identify lax transformations between adjunctions and monads with commutative squares of (monadic) right adjoints. We also identify the colax transformations whose components are equivalences (generalizing the "icons" of Lack) with the 2-morphisms that arise from viewing $(\infty,2)$-categories as simplicial $\infty$-categories. Using this characterization we identify the $\infty$-category of monads on a fixed object …
We construct a flagged $\infty$-category ${\sf Corr}$ of $\infty$-categories and bimodules among them. We prove that ${\sf Corr}$ classifies exponentiable fibrations. This representability of exponentiable fibrations extends that established by Lurie of both coCartesian fibrations and Cartesian fibrations, as they are classified by the $\infty$-category of $\infty$-categories and its opposite, respectively. We introduce the flagged $\infty$-subcategories ${\sf LCorr}$ and ${\sf RCorr}$ of ${\sf Corr}$, whose morphisms are those bimodules which are \emph{left final} and \emph{right initial}, re…
From Hopf Algebras in Model Categories to Hopf Algebras in $\infty$-categories
本文证明了对代数无余纤维性或纤维性假设时，模型范畴中的代数对象可转移到 $\infty$-范畴中，并在温和假设下将该对应推广至交换双代数和交换 Hopf 代数。
Categorical spectra as pointed $(\infty,\mathbb{Z})$-categories
该研究给出弱$\u2124$-范畴（即$(\u221e,\u2124)$-范畴）的$\u221e$-范畴定义，证明分类谱等价于带基点的$(\u221e,\u2124)$-范畴，验证二者胞元的一致性并还原Lessard对谱的相关描述。
Fully faithful functors and pushouts of $\infty$-categories
本文研究了完全忠实函子的稳定性，计算了沿其的$\infty$-范畴推出中的映射anima，并应用于Dwyer函子和Reedy范畴的推出。
On the tensor product of enriched $\infty$-categories
本文证明充实∞-范畴的张量积保持余极限并修正了前人错误，同时证明本质满射与完全忠实函子构成分解系统且与张量积及内部Hom兼容。
For most models of $(\infty,2)$-categories an embedding of the $\infty$-category of 2-categories into that of $(\infty,2)$-categories has been constructed in the form of a nerve construction of some flavor. We prove that all those nerve embeddings induce equivalent functors, modulo change of model. We also show that all the nerve embeddings realize the $\infty$-category of 2-categories as the sub-$\infty$-category of $(\infty,2)$-categories that are local with respect to a certain class of maps.
We define and discuss lax and weighted colimits of diagrams in $\infty$-categories and show that the coCartesian fibration associated to a functor is given by its lax colimit. A key ingredient, of independent interest, is a simple characterization of the free Cartesian fibration associated to a a functor of $\infty$-categories. As an application of these results, we prove that lax representable functors are preserved under exponentiation, and also that the total space of a presentable Cartesian fibration between $\infty$-categories is presentable, generalizing a theorem of Makkai and Paré to t…
Double categorical model of $(\infty,1)$-categories
基于已有工作，本文在双范畴上构造了四种模型结构，分别建模单纯空间、Segal空间、$(\infty,1)$-范畴和$\infty$-群胚，并利用Grothendieck构造给出了计算同伦余极限的显式公式。
Monoidal Relative Categories Model Monoidal $\infty$-Categories
本文证明单调相对范畴的同调理论等价于单调∞-范畴的同调理论，并在对称单调情况下同样成立。通过应用，证明了每个可呈现的单调或可呈现的对称单调∞-范畴都由单调或对称单调模型范畴呈现。
Evidence is given for the correctness of the Joyal-Riehl-Verity construction of the homotopy bicategory of the $(\infty, 2)$-category of $(\infty, 1)$-categories; in particular, it is shown that the analogous construction using complete Segal spaces instead of quasicategories yields a bicategorically equivalent 2-category.
In this paper we show that the known models for $(\infty, 1)$-categories can all be extended to equivariant versions for any discrete group $G$. We show that in two of the models we can also consider actions of any simplicial group $G$.
In this paper we study duoidal structures on $\infty$-categories of operadic modules. Let $\mathcal{O}^{\otimes}$ be a small coherent $\infty$-operad and let $\mathcal{P}^{\otimes}$ be an $\infty$-operad. If a $\mathcal{P}\otimes\mathcal{O}$-monoidal $\infty$-category $\mathcal{C}^{\otimes}$ has a sufficient supply of colimits, then we show that the $\infty$-category ${\rm Mod}_A^{\mathcal{O}}(\mathcal{C})$ of $\mathcal{O}$-$A$-modules in $\mathcal{C}^{\otimes}$ has a structure of $(\mathcal{P},\mathcal{O})$-duoidal $\infty$-category for any $\mathcal{P}\otimes\mathcal{O}$-algebra object $A$.
Free fibrations, lax colimits and Kan extensions for $(\infty,2)$-categories
本文研究了$(\infty,2)$-范畴的纤维化、余限和Kan扩展，提出了自由纤维化的构造，并给出了部分懒惰余限和Kan扩展的纤维化描述。
A homotopy coherent nerve for $(\infty,n)$-categories
本文为 $(\infty,n)$-范畴构造同伦相干神经，证明其给出严格丰富范畴与 Segal 范畴对象模型间的右 Quillen 等价，从而统一两种同伦相干图定义。
The aim of this paper is to prove a generalization of the famous Theorem A of Quillen for strict $\infty$-categories. This result is central to the homotopy theory of strict $\infty$-categories developed by the authors. The proof presented here is of a simplicial nature and uses Steiner's theory of augmented directed complexes. In a subsequent paper, we will prove the same result by purely $\infty$-categorical methods.
Adjoint functor theorems give necessary and sufficient conditions for a functor to admit an adjoint. In this paper we prove general adjoint functor theorems for functors between $\infty$-categories. One of our main results is an $\infty$-categorical generalization of Freyd's classical General Adjoint Functor Theorem. As an application of this result, we recover Lurie's adjoint functor theorems for presentable $\infty$-categories. We also discuss the comparison between adjunctions of $\infty$-categories and homotopy adjunctions, and give a treatment of Brown representability for $\infty$-catego…
Derived $\infty$-categories as exact completions
本文发展了正则 $\infty$-范畴的正合完备化理论，证明其可恢复阿贝尔范畴导出 $\infty$-范畴的连通部分，并扩展了阿贝尔范畴的经典刻画及建立了相关定理的 $\infty$-范畴版本。
Limits of $(\infty, 1)$-categories with structure and their lax morphisms
本研究将Riehl与Verity关于准范畴Eilenberg-Moore对象保极限的结果推广到多类带结构的$(\n\infty,1)$-范畴模型，证明仅需图中一个态射保结构时就存在含插入子、等化子的松弛态射极限，给出了这类极限存在的最小条件与清晰解释。
Sketchable infinity categories
本文将草图理论同伦相干地推广到$\infty$-范畴，证明了可展示$\infty$-范畴是极限草图模型，可及$\infty$-范畴是任意草图模型，并为多种$\infty$-范畴给出了具体草图。
Inspired by Lurie's theory of quasi-unital algebras we prove an analogous result for $\infty$-categories. In particular, we show that the unital structure of an $\infty$-category can be uniquely recovered from the underlying non-unital structure once suitable candidates for units have been identified. The main result of this paper can be used to produce a proof for the 1-dimensional cobordism hypothesis, as described in a forthcoming paper.
A local-global principle for parametrized $\infty$-categories
本文提出了一种关于参数化∞-范畴的局部-整体原理，通过局部数据和粘合数据描述了∞-范畴的结构，并推导了双∞-范畴CORR的分类。
This chapter, written for "Stable categories and structured ring spectra," edited by Andrew J. Blumberg, Teena Gerhardt, and Michael A. Hill, surveys the history of homotopical categories, from Gabriel and Zisman's categories of fractions to Quillen's model categories, through Dwyer and Kan's simplicial localizations and culminating in $(\infty,1)$-categories, first introduced through concrete models and later re-conceptualized in a model-independent framework. This reader is not presumed to have prior acquaintance with any of these concepts. Suggested exercises are included to fertilize intui…
In this paper we give an example of duoidal $\infty$-categories. We introduce map $\mathcal{O}$-monoidales in an $\mathcal{O}$-monoidal $(\infty,2)$-category for an $\infty$-operad $\mathcal{O}^{\otimes}$. We show that the endomorphism mapping $\infty$-category of a map $\mathcal{O}$-monoidale is a coCartesian $(Δ^{\rm op},\mathcal{O})$-duoidal $\infty$-category. After that, we introduce a convolution product on the mapping $\infty$-category from an $\mathcal{O}$-comonoidale to an $\mathcal{O}$-monoidale. We show that the $\mathcal{O}$-monoidal structure on the duoidal endomorphism mapping $\i…
Comparing lax functors of $(\infty,2)$-categories
本文研究了$(\infty,2)$-范畴的oplax正规化函子，证明了带尺度单纯集与完备Segal对象两种设定下的概念等价，并利用部分lax Kan扩张新技术构建了增强Segal对象模型。
Derived mapping spaces of $\infty$-categories
本文证明了导出映射空间引理，推广了 Cisinski 关于 $\infty$-范畴分数演算的核心定理，为分析范畴局部化中的映射空间提供了统一框架，并给出了立方或单纯范畴是底层范畴同伦等价局部化的充分条件。
Various models of $(\infty,1)$-categories, including quasi-categories, complete Segal spaces, Segal categories, and naturally marked simplicial sets can be considered as the objects of an $\infty$-cosmos. In a generic $\infty$-cosmos, whose objects we call $\infty$-categories, we introduce modules (also called profunctors or correspondences) between $\infty$-categories, incarnated as as spans of suitably-defined fibrations with groupoidal fibers. As the name suggests, a module from $A$ to $B$ is an $\infty$-category equipped with a left action of $A$ and a right action of $B$, in a suitable se…
We prove a generalization of Quillen's Theorem B to strict $\infty$-categories. More generally, we show that under similar hypothesis as for Theorem B, the comma construction for strict $\infty$-categories, that we introduced with Maltsiniotis in a previous paper, is the homotopy pullback with respect to Thomason equivalences. We give several applications of these results, including the construction of new models for certain Eilenberg-Mac Lane spaces.
A model-independent Gray tensor product for $(\infty,2)$-categories
本文构造了 $(\infty,2)$-范畴的模型无关 Gray 张量积，并证明其由与经典严格 2-范畴 Gray 张量积在 Gray 立方体上一致的唯一幺半双闭结构所刻画。
Straightening for lax transformations and adjunctions of $(\infty,2)$-categories
本文建立任意 $(\infty,2)$-范畴上松弛变换的不拉直定理，并用于刻画加权（余）极限、函子范畴中的伴随及配偶对应。
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