Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Canonical formalism and quantization of perturbative sector of
  higher-derivative theories   The theories defined by Lagrangians containing second time derivative are
considered. It is shown that if the second derivatives enter only the terms
multiplied by coupling constant one can consistently define the perturbative
sector via Dirac procedure. The possibility of introducing standard canonical
variables is analysed in detail. The ambiguities in quantization procedure are
pointed out.

9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat