Haifeng Xu

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20132017

most citedThe largest cycles consist by the quadratic residues and Fermat primes

2 citations · 3 across the 7 of their papers we have counts for

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math.CA2014

Note on the Hölder norm estimate of the function $x sin (1/ x)$

Jiaqiang Mei, Haifeng Xu

In this paper, we prove the following inequality: for any $x, y > 0$ , there holds $x sin \frac{1}{x} - y sin \frac{1}{y} \leq 2∣ x - y ∣ .$

math.CA2014

The limit of the m-norms of a class of symmetric matrices and its applications

Haifeng Xu, Binxian Yuan, Zuyi Zhang +1

We consider a special symmetric matrix and obtain a similar formula as the one obtained by Weyl's criterion. Some applications of the formula are given, where we give a new way to…

Note on the Hölder norm estimate of the function xsin(1/x)

The limit of the m-norms of a class of symmetric matrices and its applications

Note on the Hölder norm estimate of the function $x sin (1/ x)$