Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Critique du rapport signal \`a bruit en th\'eorie de l'information -- A
  critical appraisal of the signal to noise ratio in information theory   The signal to noise ratio, which plays such an important role in information
theory, is shown to become pointless in digital communications where - symbols
are modulating carriers, which are solutions of linear differential equations
with polynomial coefficients, - demodulations is achieved thanks to new
algebraic estimation techniques. Operational calculus, differential algebra and
nonstandard analysis are the main mathematical tools.

16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th