Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Introduction to the theory of quasi-log varieties   This paper is a gentle introduction to the theory of quasi-log varieties by
Ambro. We explain the fundamental theorems for the log minimal model program
for log canonical pairs. More precisely, we give a proof of the base point free
theorem for log canonical pairs in the framework of the theory of quasi-log
varieties.

28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph