Somchai Somphotphisut

collaborators

3 papers

math.SP2017

On the normal centrosymmetric Nonnegative inverse eigenvalue problem

Somchai Somphotphisut, Keng Wiboonton

We give sufficient conditions of the nonnegative inverse eigenvalue problem (NIEP) for normal centrosymmetric matrices. These sufficient conditions are analogous to the sufficient…

math.RA2017

A characterization of trace zero bisymmetric nonnegative $5 \times 5$ matrices

Somchai Somphotphisut, Keng Wiboonton

Let $λ_{1} \geq λ_{2} \geq λ_{3} \geq λ_{4} \geq λ_{5} \geq - λ_{1}$ be real numbers such that $\sum_{i = 1}^{5} λ_{i} = 0$ . In \cite{oren}, O. Spector prove that a necessary and sufficient condition…

math.SP2015

On the bisymmetric nonnegative inverse eigenvalue problem

Somchai Somphotphisut, Keng Wiboonton

We study the bisymmetric nonnegative inverse eigenvalue problem (BNIEP). This problem is the problem of finding the necessary and sufficient conditions on a list of $n$ complex num…

On the normal centrosymmetric Nonnegative inverse eigenvalue problem

A characterization of trace zero bisymmetric nonnegative 5×5 matrices

On the bisymmetric nonnegative inverse eigenvalue problem

A characterization of trace zero bisymmetric nonnegative $5 \times 5$ matrices