Lin Si

collaborators

2 papers

math.CO2010

Mixed-Mean Inequality for Submatrix

Lin Si, Suyun Zhao

For a $m \times n$ matrix $B = (b_{ij})_{m \times n}$ with nonnegative entries $b_{ij}$ and any $k \times l -$ submatrix $B_{ij}$ of $B$ , let $a_{B_{ij}}$ and $g_{B_{ij}}$ denote the arit…

math.CO2010

The John Theorem for Simplex

Si Lin, Xiong Ge, Leng Gangsong

In this paper, we give a description of the John contact points of a regular simplex. We prove that the John ellipsoid of any simplex is ball if and only if this simplex is regular…