A relaxed dissipativeness test for the stability of large-scale systems

A recently published stability criterion allows checking the stability of a large-scale system whose subsystems are dissipative. (Dissipativeness is a property, akin to, but more general than, passivity.) The criterion requires that a certain test matrix be positive definite. It is now shown that one can sometimes deduce stability when the test matrix is merely nonnegative definite.