Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The geometry of second-order ordinary differential equations   These are lecture notes of the Summer school on the geometry of differential
equations held in Nordfjordeid, Norway in 1996. They cover geometric structures
related to scalar second order ODEs, the construction of the associated Cartan
connection, techniques for computing invariants of differential equations
starting from the Cartan connection, recognition of symmetric 2nd order ODEs by
their differential invariants and the constructive aspects of the local
equivalence problem.

37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an