Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Sliceness Criterion for Odd Free Knots   The main goal of this paper is to prove that for odd free knots - that is
free knots with all odd crossings - the problem of sliceness (the existence of
a spanning disc) has an explicit answer based on the pairing of the knot
diagram chords.

7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol