Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Alternative proofs of Shafer's inequality for inverse hyperbolic tangent   We point out that a concise proof of Theorem 2 in the article, 'On a
quadratic estimate of Shafer' by L. Zhu contains a small mistake. Correcting
this mistake and giving alternative proofs of Theorem 2 is the main aim of this
note.

28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con