Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interpretation of the Formation Volume of Defects in Crystal Growth   In the calculation of the formation enthalpy of a defect, a stress term
accompanying the formation volume of the defect appears. This formation volume
is conventionally interpreted as the difference in volume between crystals with
and without the defect. When defect formation is investigated in the study of
crystal growth, the interpretation is sometimes misused by separately treating
the volumes of the defect and perfect crystal. However, these two quantities
are inseparable, and only the difference between them has physical reality.

24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics