From: categories <cat-dist@mta.ca>
To: categories <categories@mta.ca>
Subject: An introduction to n-categories
Date: Thu, 15 May 1997 22:18:45 -0300 (ADT) [thread overview]
Message-ID: <Pine.OSF.3.90.970515221835.26627H-100000@mailserv.mta.ca> (raw)
Date: Tue, 13 May 1997 17:29:58 -0700 (PDT)
From: john baez <baez@math.ucr.edu>
Here is the abstract of a paper that is now available in Postscript
form at:
http://math.ucr.edu/home/baez/ncat.ps
If downloading it or printing it out is a problem, I can mail copies
to people.
----------------------------------------------------------------------
An Introduction to n-Categories
John C. Baez
An n-category is some sort of algebraic structure consisting of objects,
morphisms between objects, 2-morphisms between morphisms, and so on up
to n-morphisms, together with various ways of composing them. We survey
various concepts of n-category, with an emphasis on `weak' n-categories,
in which all rules governing the composition of j-morphisms hold only up
to equivalence. (An n-morphism is an equivalence if it is invertible,
while a j-morphism for j < n is an equivalence if it is invertible up to
a (j+1)-morphism that is an equivalence.) We discuss applications of
weak n-categories to various subjects including homotopy theory and
topological quantum field theory, and review the definition of weak
n-category recently proposed by Dolan and the author.
reply other threads:[~1997-05-16 1:18 UTC|newest]
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