Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Planar diagrammatics of self-adjoint functors and recognizable tree
  series   A pair of biadjoint functors between two categories produces a collection of
elements in the centers of these categories, one for each isotopy class of
nested circles in the plane. If the centers are equipped with a trace map into
the ground field, then one assigns an element of that field to a diagram of
nested circles. We focus on the self-adjoint functor case of this construction
and study the reverse problem of recovering such a functor and a category given
values associated to diagrams of nested circles.

11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con