Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the fundamental groups of non-generic $\mathbb{R}$-join-type curves   An \emph{$\mathbb{R}$-join-type curve} is a curve in $\mathbb{C}^2$ defined
by an equation of the form \begin{equation*} a\cdot\prod_{j=1}^\ell
(y-\beta_j)^{\nu_j} = b\cdot\prod_{i=1}^m (x-\alpha_i)^{\lambda_i},
\end{equation*} where the coefficients $a$, $b$, $\alpha_i$ and $\beta_j$ are
\emph{real} numbers. For generic values of $a$ and $b$, the singular locus of
the curve consists of the points $(\alpha_i,\beta_j)$ with $\lambda_i,\nu_j\geq
2$ (so-called \emph{inner} singularities). In the non-generic case, the inner
singularities are not the only ones: the curve may also have \emph{`outer'}
singularities. The fundamental groups of (the complements of) curves having
only inner singularities are considered in \cite{O}. In the present paper, we
investigate the fundamental groups of a special class of curves possessing
outer singularities.

10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin