Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generalized Bianchi identities in gauge-natural field theories and the
  curvature of variational principles   By resorting to Noether's Second Theorem, we relate the generalized Bianchi
identities for Lagrangian field theories on gauge-natural bundles with the
kernel of the associated gauge-natural Jacobi morphism. A suitable definition
of the curvature of gauge-natural variational principles can be consequently
formulated in terms of the Hamiltonian connection canonically associated with a
generalized Lagrangian obtained by contracting field equations.

8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an