A characterization theorem for the evolution semigroup generated by the sum of two unbounded operators

We consider a class of evolution problems characterized by the sum of two unbounded linear operators A and B, where A is assumed to generate a positive semigroup of contractions on an L1‐space and B is positive. We study the relations between the semigroup generator G and the operator A+B. A charact...

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Veröffentlicht in:	Mathematical methods in the applied sciences 2004-04, Vol.27 (6), p.669-685
Hauptverfasser:	Frosali, Giovanni, van der Mee, Cornelis V. M., Mugelli, Francesco
Format:	Artikel
Sprache:	eng
Schlagworte:	abstract Cauchy problem fragmentation model perturbation theory semigroup theory
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