Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Drawing with Complex Numbers   It is not commonly realized that the algebra of complex numbers can be used
in an elegant way to represent the images of ordinary 3-dimensional figures,
orthographically projected to the plane. We describe these ideas here, both
using simple geometry and setting them in a broader context.

3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph