Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Directional Heisenberg uncertainty product   A directional time-frequency localization measure for functions defined on
the $d$-dimensional Euclidean space is introduced. A connection between this
measure and its periodic counterpart is established. For a class of functions,
an optimization problem for finding the optimal direction, along which a
function is best or worst localized, is solved.

20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph