arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0711.4657math.CT
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Stephen Lack

摘要:

范畴正统理论认为,普通数学结构的集合,如群、环或空间,形成范畴(如群范畴);一维范畴结构的集合,如范畴、幺半范畴或有限极限范畴,形成2范畴;二维范畴结构的集合,如2范畴或双范畴,形成3范畴。我们描述了一个有用的方式,把bicategories作为对象的2类。无论是从技术上还是从概念上来说,这都有点令人惊讶。这个2-类别的2-细胞是关键的新成分;它们是标题的图标。这些可以被认为是“其组成部分是恒等式的oplax自然变换”,但我们也将给出一个更基本的描述。我们描述了这些图标的一些性质,并给出应用程序的幺半范畴,2-神经的bicategories,2维Lawvere理论,束的bicategories。

英文摘要:

Categorical orthodoxy has it that collections of ordinary mathematical structures such as groups, rings, or spaces, form categories (such as the category of groups); collections of 1-dimensional categorical structures, such as categories, monoidal categories, or categories with finite limits, form 2-categories; and collections of 2-dimensional categorical structures, such as 2-categories or bicategories, form 3-categories. We describe a useful way in which to regard bicategories as objects of a 2-category. This is a bit surprising both for technical and for conceptual reasons. The 2-cells of this 2-category are the crucial new ingredient; they are the icons of the title. These can be thought of as ``the oplax natural transformations whose components are identities'', but we shall also give a more elementary description. We describe some properties of these icons, and give applications to monoidal categories, to 2-nerves of bicategories, to 2-dimensional Lawvere theories, and to bundles of bicategories.

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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