Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Graded change of ring   We investigate scalar restriction, scalar extension, and scalar coextension
functors for graded modules, including their interplay with coarsening
functors, graded tensor products, and graded Hom functors. This leads to
several characterisations of epimorphisms of graded rings.

23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat