Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Football: A Naive Approximation to the Effect of Increasing Goal Size on
  the Number of Goals   The effect of increasing goal mouth size on the number of goals scored in a
football match is discussed in a very preliminary and simple way, considering
elastic collisions of the ball with the posts. The result is obtained on the
basis of data taken from the Spanish Professional League, that show a high
number of shots-to-post. Surprisingly, there is a direct correlation of the
increase in goal mouth area with the increase of goals.

30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex