Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relative Rips Machine   We study isometric actions of finitely presented groups on
$\mathbb{R}$-trees. In this paper, we develop a relative version of the Rips
machine to study $\textit{pairs}$ of such actions. An important example of a
$\textit{pair}$ is a group action on an $\mathbb{R}$-tree and a subgroup action
on its minimal invariant subtree.

30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex