Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Excluding a full grid minor   In this paper we characterise the graphs containing a $\mathbb{Z} \times
\mathbb{Z}$ grid minor in a similar way as it has been done by Halin for graphs
with an $\mathbb{N} \times \mathbb{Z}$ grid minor. Using our characterisation,
we describe the structure of graphs without $\mathbb{Z} \times \mathbb{Z}$ grid
minors in terms of tree-decompositions.

13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin