Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Some constants related to numerical ranges   In an attempt to progress towards proving the conjecture the numerical range
W (A) is a 2--spectral set for the matrix A, we propose a study of various
constants. We review some partial results, many problems are still open. We
describe our corresponding numerical tests.

8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat