  Let $r$ be any real number and for any $n$ let $p_1,\ldots,p_n$ be distinct
positive numbers. A Kwong matrix is the $n\times n$ matrix whose $(i,j)$ entry
is $(p_i^r+p_j^r)/(p_i+p_j).$ We determine the signatures of eigenvalues of all
such matrices. The corresponding problem for the family of Loewner matrices
$\begin{bmatrix}(p_i^r-p_j^r)/(p_i-p_j)\end{bmatrix}$ has been solved earlier.

Classical Analysis and ODEs