Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A free boundary problem with non local interaction   We prove local existence for classical solutions of a free boundary problem
which arises in one of the biological selection models proposed by Brunet and
Derrida, [2] and Durrett and Remenik, [14]. The problem we consider describes
the limit evolution of branching brownian particles on the line with death of
the leftmost particle at each creation time as studied in [12]. We use
extensively results in [5] and [15].

6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th