When is a Matrix Sign Stable?
Clark D. Jeffries, Victor L. Klee, Pauline Van den Driessche · Canadian Journal of Mathematics · 1977
An n X n real matrix A = (aij) is called stable (resp. semistable) if each of its eigenvalues has negative (resp. nonpositive) real part. These notions are important because of their close connection with the stability of motion, which can be described especially simply for a system