Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Music of the Spheres: Teaching Quantum Field Theory at the Introductory
  Level   Quantum field theory has formed the conceptual framework of most of physics
for more than sixty years. It incorporates a complete revision of our
conception of the nature of matter and existence itself. Yet it is rarely
taught, or even mentioned, in introductory physics---from high school, college,
and university survey courses through upper-division "modern physics" courses.
This omission is not necessary: This paper describes an approach through which
the fundamental concepts and consequent insights of quantum field theory can be
grasped, building upon familiar notions from classical and quantum mechanics.

8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an