Taxisstand in a rank waiting t

S rank,A rank A rank 设A,B,C分别为m*n,n*s,s*t矩阵,证明rank(B)+rank(ABC)>rank(AB)+rank(BC) rank(AB)>=rank(A)+rank(B)-n,这是什么意思? 英语翻译I can't stand it!I don't like waiting in line when a sho I don't like waiting in line when a shop a ssistant has a lo 线性代数中rank(A, I,like,don't,waiting,lire,in,a,when,shop,assistant,has,a,tel 英语翻译I don't like waiting in line when a shop assistant has a Don't forget there is a person still in place waiting for yo waiting in line is a good habit for everyone.please don't __ 线性代数证明rank（AT*A)=rank（A）