Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interferometry concepts   This paper serves as an introduction to the current book. It provides the
basic notions of long-baseline optical/infrared interferome-try prior to
reading all the subsequent chapters, and is not an extended introduction to the
field.

7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg