Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pseudolattices, del Pezzo surfaces, and Lefschetz fibrations   Motivated by the relationship between numerical Grothendieck groups induced
by the embedding of a smooth anticanonical elliptic curve into a del Pezzo
surface, we define the notion of a quasi del Pezzo homomorphism between
pseudolattices and establish its basic properties. The primary aim of the paper
is then to prove a classification theorem for quasi del Pezzo homomorphisms,
using a pseudolattice variant of the minimal model program. Finally, this
result is applied to the classification of a certain class of genus one
Lefschetz fibrations over discs.

23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga