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arXiv 1405.7263math.CT
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比较$n$的代数和非代数基础--范畴论

Comparing algebraic and non-algebraic foundations of $n$-category theory

Thomas Cottrell

摘要:

弱n-范畴的定义已有很多种。人们已经广泛观察到,这些定义中的每一个都是两种类型之一:代数定义,其中明确指定了复合和相干单元,以及非代数定义,其中仅需要存在复合和约束单元的相干选择。在定义之间进行的比较相对较少,大多数比较只涉及一种类型的定义之间的关系。本文的目的是建立更多的比较,包括代数定义和非代数定义之间的比较。论文分为两个部分。第一部分讨论了弱n-范畴的三种代数定义之间的关系:Penon和Batanin的定义,以及Batanin定义的Leinster变体。在Batanin和Leinster的定义中,用于定义组合和连贯性的结构之间的对应关系一直被怀疑;我们第一次精确地说明了这一点。我们使用这种对应关系来证明几个相干定理,适用于所有三个定义,并采取第一步描述之间的关系弱n-范畴的Batanin和Leinster。在第2部分中,我们迈出了第一步,以神经构造的形式比较了Penon的弱n-范畴定义与非代数定义(Tamsamani定义的Simpson变体)之间的比较。作为这个神经结构的原型,我们回顾了Leinster提出的双范畴的神经结构,并证明了由这个结构给出的双范畴的神经是Tamsamani-Simpson弱2-范畴。然后,我们定义我们的神经函子Penon弱n-范畴。我们证明了Penon弱2-范畴的神经是Tamsamani-Simpson弱2-范畴,并猜想这一结果对更高的n成立.

英文摘要:

Many definitions of weak n-category have been proposed. It has been widely observed that each of these definitions is of one of two types: algebraic definitions, in which composites and coherence cells are explicitly specified, and non-algebraic definitions, in which a coherent choice of composites and constraint cells is merely required to exist. Relatively few comparisons have been made between definitions, and most of those that have concern the relationship between definitions of just one type. The aim of this thesis is to establish more comparisons, including a comparison between an algebraic definition and a non-algebraic definition. The thesis is divided into two parts. Part 1 concerns the relationships between three algebraic definitions of weak n-category: those of Penon and Batanin, and Leinster's variant of Batanin's definition. A correspondence between the structures used to define composition and coherence in the definitions of Batanin and Leinster has long been suspected; we make this precise for the first time. We use this correspondence to prove several coherence theorems that apply to all three definitions, and to take the first steps towards describing the relationship between the weak n-categories of Batanin and Leinster. In Part 2 we take the first step towards a comparison between Penon's definition of weak n-category and a non-algebraic definition, Simpson's variant of Tamsamani's definition, in the form of a nerve construction. As a prototype for this nerve construction, we recall a nerve construction for bicategories proposed by Leinster, and prove that the nerve of a bicategory given by this construction is a Tamsamani--Simpson weak 2-category. We then define our nerve functor for Penon weak n-categories. We prove that the nerve of a Penon weak 2-category is a Tamsamani--Simpson weak 2-category, and conjecture that this result holds for higher n.

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