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arXiv 1005.4633math.CTmath.AT
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弱猫运算

Weak Cat-Operads

Kosta DOSEN, Zoran Petric

摘要:

一个运算符(本文讨论的是非对称运算符)可以被认为是一个具有一族插入运算的部分代数,Gerstenhaber的circle-i积,它满足两种结合性,其中一种涉及交换性。猫操作数是在小范畴的范畴Cat上丰富的操作数,因为具有小hom-categories的2-范畴是在Cat上丰富的范畴。弱猫操作数的概念对于猫操作数的概念就像双范畴的概念对于2-范畴的概念一样。像插入的结合性这样的运算方程被范畴中的同构所取代。本文的目标是制定有关这些同构的条件,确保一致性,在这个意义上说,所有的图规范箭头交换。在这个意义上,幺半范畴和双范畴的概念是一致的。本文中的一致性证明通过以上下文无关的方式而不是以通常的方式索引插入操作而大大简化。这个证明,这是在风格的长期重写,涉及到一个参数与正规形式,概括了什么是建立与完备性证明的标准介绍对称群。这一概括可能是一个独立的利益,并与其他事项的研究在本文中。弱猫算符的一些相干条件导致半结合面体,它是与三维结合面体和置换面体相关但不同的多面体。

英文摘要:

An operad (this paper deals with non-symmetric operads)may be conceived as a partial algebra with a family of insertion operations, Gerstenhaber's circle-i products, which satisfy two kinds of associativity, one of them involving commutativity. A Cat-operad is an operad enriched over the category Cat of small categories, as a 2-category with small hom-categories is a category enriched over Cat. The notion of weak Cat-operad is to the notion of Cat-operad what the notion of bicategory is to the notion of 2-category. The equations of operads like associativity of insertions are replaced by isomorphisms in a category. The goal of this paper is to formulate conditions concerning these isomorphisms that ensure coherence, in the sense that all diagrams of canonical arrows commute. This is the sense in which the notions of monoidal category and bicategory are coherent. The coherence proof in the paper is much simplified by indexing the insertion operations in a context-independent way, and not in the usual manner. This proof, which is in the style of term rewriting, involves an argument with normal forms that generalizes what is established with the completeness proof for the standard presentation of symmetric groups. This generalization may be of an independent interest, and related to matters other than those studied in this paper. Some of the coherence conditions for weak Cat-operads lead to the hemiassociahedron, which is a polyhedron related to, but different from, the three-dimensional associahedron and permutohedron.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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