Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fundamental Quantal Paradox and its Resolution   The postulate that coordinate and momentum representations are related to
each other by the Fourier transform has been accepted from the beginning of
quantum theory. As a consequence, coordinate wave functions of photons emitted
by stars have cosmic sizes. This results in a paradox because predictions of
the theory contradict observations. The reason of the paradox and its
resolution are discussed.

11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex