Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A fractional framework for perimeters and phase transitions   We review some recent results on minimisers of a non-local perimeter
functional, in connection with some phase coexistence models whose diffusion
term is given by the fractional Laplacian.

14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an