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On the spectral bound of the generator of semigroups of positive operators. (English) Zbl 0469.47032

MSC:
47D03 Groups and semigroups of linear operators
34G10 Linear differential equations in abstract spaces
35G10 Initial value problems for linear higher-order PDEs
35K25 Higher-order parabolic equations
47A55 Perturbation theory of linear operators
47A10 Spectrum, resolvent
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