Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Divergences in formal variational calculus and boundary terms in
  Hamiltonian formalism   It is shown how to extend the formal variational calculus in order to
incorporate integrals of divergences into it. Such a generalization permits to
study nontrivial boundary problems in field theory on the base of canonical
formalism.

35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio