how to proof the sabinvariance theorem?
the sabinvariance theorem:
Let T be a non-negative irreducible matrix,s a positve number.and y>=.=0.a vector satisfying Ty<=sy.
Then (a) y>0;(b)s>=r,where r is the Perron-Frobenius eigenvalue of T.
Moreover,s=r if and only if Ty=sy.
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