Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Renormalization group for the internal space   The renormalization group method is a successive integration over the
fluctuations which are ordered according to their length scale, a parameter in
the external space. A different procedure is described, where the fluctuations
are treated in a successive manner, as well, but their order is given by an
internal space parameter, their amplitude. The differential version of the
renormalization group equation is given which is the functional generalization
of the Callan-Symanzik equation in one special case and resums the loop
expansion in another one.

37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph