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An elementary proof of the Hopf inequality for positive operators. (English) Zbl 0148.38103

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References:
[1] Birkhoff, G.: Extensions of Jentzsch’s Theorem. Trans. Amer. Math. Soc.85, 219-227 (1957). · Zbl 0079.13502
[2] Birkhoff, G.: Lattice theory. Amer. Math. Soc. Publ. XXV, 1948. · Zbl 0033.10103
[3] Hopf, E.: An Inequality for positive linear Integral Operators. J. of Math. and Mech.12, 683-692 (1963). · Zbl 0115.32501
[4] Ostrowski, A. M.: Positive Matrices and Functional Analysis. In: Recent Advances in Matrix Theory. Madison: Univ. of Wisconsin Press 1964. · Zbl 0135.01504
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