@Preben Alsholm Okay. I will find out about the Routh-Hurwitz criterion. Thank You for your help.

@Preben Alsholm Okay. I will find out about the Routh-Hurwitz criterion. Thank You for your help.

im sorri i mean the matrix is

Thank you.

erratum

Thank you for your response. Actually i just need to know, when ​​will all the eigenvalues be negative, for checking the stability of a system. Under what conditions this matrix has ​​all negative eigenvalues? Do you have any idea?

Thank you for your response. Actually i just need to know, when ​​will all the eigenvalues be negative, for checking the stability of a system. Under what conditions this matrix has ​​all negative eigenvalues? Do you have any idea?