Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lectures on Topology of Words   We discuss a topological approach to words introduced by the author. Words on
an arbitrary alphabet are approximated by Gauss words and then studied up to
natural modifications inspired by the Reidemeister moves on knot diagrams. This
leads us to a notion of homotopy for words. We introduce several homotopy
invariants of words and give a homotopy classification of words of length five.

17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys