Abstract
LetX be a locally compact space, andT, a quasi-compact positive operator onC 0(X), with positive spectral radius,r. Then the peripheral spectrum ofT is a finite set of poles containingr, and the residue of the resolvent ofT at each peripheral pole is of finite rank. Using the concept of closed absorbing set, we develop an iterative process that gives the order,p, ofr, some special bases of the algebraic eigenspaces ker(T-r) p and ker(T *-r)p, and finally the dimension of the algebraic eigenspace associated to each peripheral pole.
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