Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An elementary proof for that all unoriented spanning surfaces of a link
  are related by attaching/deleting tubes and M\"{o}bius bands   Gordon and Litherland showed that all compact, unoriented, possibly
non-orientable surfaces in $S^3$ bounded by a link are realted by
attaching/deleting tubes and half twisted bands. In this note we give an
elementary proof for this result.

33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin