Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: La th\'eorie de l'homotopie des 2-cat\'egories   On d\'eveloppe une th\'eorie de l'homotopie des 2-cat\'egories analogue \`a
la th\'eorie de l'homotopie des cat\'egories d\'evelopp\'ee par Grothendieck
dans "\`A la poursuite des champs". Il s'agit de la th\`ese de doctorat de
l'auteur.
  We develop a homotopy theory of 2-categories analogous to Grothendieck's
homotopy theory of categories developed in "Pursuing Stacks." This is the
author's PhD thesis.

7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas