Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Make your Boy surface   This is an introductory article about the Boy surface. Boy found 1901 that
$\mathbb{R}P^2$ can be immersed into $\mathbb{R}^3$, and published it. (The
image of) the immersion is called the Boy surface after Boy's discovery. We
have created a way to construct the Boy surface by using a pair of scissors, a
piece of paper, and a strip of scotch tape. In this article we introduce the
way. Furthermore, we make a movie to show the paper-craft actually, and put it
in a website. One can find the website by typing in the author's name or the
title of this article in the search engine.

7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int