Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Dual Quark Models   We briefly recall the historical environment around our 1971 and 1975
constructions of current-algebraic internal symmetry on the open string. These
constructions included the introduction of world sheet fermions, the
independent discovery of affine Lie algebra in physics (level one of affine
su(3)), the first examples of the affine-Sugawara and coset constructions, and
finally - from compactified spatial dimensions on the string - the first
vertex-operator constructions of the fermions and level one of affine su(n).

24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys