The absolute stability of a class of indirect control systems by applying the theory of Hermitian quadratic form and Jordan normal form was studied. 利用厄米特二次型和若當標準形理論研究了一般間接控制系統的絕對穩定性問(wèn)題，給出了絕對穩定性的代數形式的判別準則。
The governments of Burkina Faso and Sierra Leone have started to negotiate with wholesalers to control prices indirectly. 布基納法索和塞納里昂政府已經(jīng)開(kāi)始與批發(fā)商協(xié)商，以此間接控制糧價(jià)。
