2 papers
math.MG2010
On Edwards-Child's inequality
Yudong Wu, Zhihua Zhang, Zhigang Wang
In this paper, by making use of one of Chen's theorems and the method of mathematical analysis, we refine Edwards-Child's inequality and solve a conjecture posed by Liu.
math.MG2010
On the circumradius of a special class of n-simplices
Yudong Wu, Zhihua Zhang
An n-simplex is called circumscriptible (or edge-incentric) if there is a sphere tangent to all its n(n + 1)/2 edges. We obtain a closed formula for the radius of the circumscribed…