Stability in a Linear Delay System without Instantaneous Negative Feedback
Joseph W.-H. So, Xianhua Tang, Xingfu Zou · SIAM Journal on Mathematical Analysis · 2002
It is shown that every solution of a linear differential system with constant coefficients and time delays tends to zero if a certain matrix derived from the coefficient matrix is a nonsingular M-matrix and the diagonal delays satisfy the so-called 3/2 condition.