On Comparing Definitions of "weak N–category"

نویسنده

  • M Makkai
چکیده

1. My approach is "foundational". On the one hand, I am motivated by the problem of the foundations of mathematics (an unsolved problem as far as I am concerned). On the other hand-and this is more relevant here-, I start "from scratch", and thus what I say can be understood with little technical knowledge. I only assume a modest amount of category theory as background. I will talk informally about technical matters that are written down formally elsewhere, where they can be studied further. [The text in square brackets [-] is either some technical explanation, or a digression.] 2. Terminology First, some terminological conventions. I will use the word "category" in its most general sense: weak ω-category. This is completely inclusive: all sorts of "categories" are categories ow. here are two extensions of the original meaning: "weak", and "omega-dimensional". Weak" signifies an indeterminate notion; there are several different specific versions of weak ategory. It can also be used as a vague notion, when one is merely looking at what one would ike to have. There are specific kinds of category, such as "Batanin category" [B1], "multitopic ategory" [HMP1,2,3,4,5], [M8]. When one wants to talk about the "ordinary, strict" version of he notion, one says "strict". Thus, "strict category" is my term for an ordinary, strict ω-category. he main reason for the terminology is the desire to banish the word "weak".-categories, for finite n , are "truncated" categories; they are particular kinds of, possibly eak, categories (namely, ω-categories) in fact.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

A SURVEY OF DEFINITIONS OF n-CATEGORY

Many people have proposed definitions of ‘weak n-category’. Ten of them are presented here. Each definition is given in two pages, with a further two pages on what happens when n ≤ 2. The definitions can be read independently. Chatty bibliography follows.

متن کامل

Steps toward the weak higher category of weak higher categories in the globular setting

We start this article by rebuilding higher operads of weak higher transformations, and correct those in cite{Cambat}. As in cite{Cambat} we propose an operadic approach for weak higher $n$-transformations, for each $ninmathbb{N}$, where such weak higher $n$-transformations are seen as algebras for specific contractible higher operads. The last chapter of this article asserts that, up to precise...

متن کامل

بررسی صحت داده های موجود در پرونده خانوارهای ساکن مناطق روستایی شهرستان همدان در سال 1390

Introduction & Objective: Initial information is necessary for decision and policy making. A weak information system leads to poor decision-making but the accuracy of data registration and collection can be a valid supporter for assessing health system and management decisions in programming. For the first time, we checked the accuracy of the data collected from the households in the health c...

متن کامل

n-fold Commutative Hyper K-ideals

 In this paper, we aresupposed to introduce the definitions of n-fold commutative, andimplicative hyper K-ideals. These definitions are thegeneralizations of the definitions of commutative, andimplicative hyper K-ideals, respectively, which have been definedin [12]. Then we obtain some related results. In particular wedetermine the relationships between n-fold implicative hyperK-ideal and n-fol...

متن کامل

Weak identity arrows in higher categories

There are a dozen definitions of weak higher categories, all of which loosen the notion of composition of arrows. A new approach is presented here, where instead the notion of identity arrow is weakened — these are tentatively called fair categories. The approach is simplicial in spirit, but the usual simplicial category ∆ is replaced by a certain ‘fat’ delta of ‘coloured ordinals’, where the d...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2001