Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Characteristic foliations of material evolution: from remodeling to
  aging   For any body-time manifold $\mathbb{R} \times \mathcal{B}$ there exists a
groupoid, called material groupoid, encoding all the material properties of the
evolution material. A smooth distribution, the material distribution, is
constructed to deal with the case in which the material groupoid is not a Lie
groupoid. This new tool provides a unified framework to deal with general
non-uniform evolution materials.

15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn