Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gradient Bounds and Coarsening Estimates for Some Molecular Beam Epitaxy
  Models   We prove global well-posedness for some molecular beam epitaxy models. This
requires proving some bounds on the gradient of solutions. We also obtain some
global bounds on the roughness of solutions.

15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph