Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strong data processing constant is achieved by binary inputs   For any channel $P_{Y|X}$ the strong data processing constant is defined as
the smallest number $\eta_{KL}\in[0,1]$ such that $I(U;Y)\le \eta_{KL} I(U;X)$
holds for any Markov chain $U-X-Y$. It is shown that the value of $\eta_{KL}$
is given by that of the best binary-input subchannel of $P_{Y|X}$. The same
result holds for any $f$-divergence, verifying a conjecture of Cohen, Kemperman
and Zbaganu (1998).

4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an