Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rost invariant on the center, revisited   The Rost invariant of the Galois cohomology of a simple simply connected
algebraic group over a field $F$ is defined regardless of the characteristic of
$F$, but unfortunately some formulas for it are only known with some hypothesis
on the the characteristic. We improve those formulas by (1) removing the
hypothesis on the characteristic and (2) removing an ad hoc pairing that
appears in the original formulas. As a preliminary step of independent
interest, we also extend the classification of invariants of quasi-trivial tori
to all fields.

21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex