Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Lagrangean formalism for Hermitean matrix models   Eynard's formulation of Hermitean 1-matrix models in terms of intrinsic
quantities of an associated hyperelliptic Riemann surface is rephrased as a
Lagrangean field theory of a scalar particle propagating on the hyperelliptic
surface with multiple self-interactions and particle-source interactions. Both
types of interaction take place at the branch points of the hyperelliptic
surface.

8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc