Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On semistable Mori contractions   We study Mori fiber spaces over a two-dimensional base which satisfy the
semistability assumption. As an application of our technique we give a new
proof of the existence of semistable 3-fold flips.

35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th