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By using the theory of strongly continuous cosine families of linear operators in Banach space the existence of solutions of some semilinear second order Volterra integrodifferential equations in Banach spaces is proved. The results are applied to some integro-partial differential equations.
Motivated by structured parasite populations in aquaculture we consider a class of
size-structured population models, where individuals may be recruited into the population
with distributed states at birth. The mathematical model which describes the evolution of
such a population is a first-order nonlinear partial integro-differential equation of
hyperbolic type. First, we use positive perturbation arguments and utilise results from
the spectral...
It is proved that parabolic equations with infinite delay generate -semigroup on the space of initial conditions, such that local stable and unstable manifolds can be constructed for a fully nonlinear problems with help of usual methods of the theory of parabolic equations.
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