Geodesic
On Eigenvalues for Some Classes of Positive Operators
Matematičeskie zametki, Tome 85 (2009) no. 2, pp. 214-226.

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Spectral gaps are estimated for some classes of positive operators with a group of leading eigenvalues. Such an analysis is based on passing to associated operators and using the notion of a focusing operator. We show how to weaken the requirements on the class of operators under study, which arises, in particular, in transport theory.
Keywords: positive linear operator, totally positive operator, focusing operator, sign-regular operator, spectral gap, eigenvalue problem. 
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R. S. Makin. On Eigenvalues for Some Classes of Positive Operators. Matematičeskie zametki, Tome 85 (2009) no. 2, pp. 214-226. http://geodesic.mathdoc.fr/item/MZM_2009_85_2_a4/

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