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Finite element approximation for degenerate parabolic equations is considered. We propose a semidiscrete scheme provided with order-preserving and contraction properties, making use of piecewise linear trial functions and the lumping mass technique. Those properties allow us to apply nonlinear semigroup theory, and the wellposedness and stability in and , respectively, of the scheme are established. Under certain hypotheses on the data, we also derive convergence without any convergence rate....
Finite element approximation for degenerate parabolic equations is
considered.
We propose a semidiscrete scheme provided with order-preserving
and L1 contraction properties, making use of piecewise linear
trial functions and the lumping mass technique.
Those properties allow us to apply nonlinear semigroup theory,
and the wellposedness and stability in L1 and L∞,
respectively, of the scheme are established.
Under certain hypotheses on the data, we also derive L1
convergence without any...
We prove the following theorem: Let p > 1 and let E be a real p-uniformly convex Banach space, and C a nonempty bounded closed convex subset of E. If is a Lipschitzian semigroup such that , where c > 0 is some constant, then there exists x ∈ C such that for all s ∈ G.
A model of chemotaxis is analyzed that prevents blow-up of solutions. The model
consists of a system of nonlinear partial differential equations for the spatial population
density of a species and the spatial concentration of a chemoattractant in n-dimensional
space. We prove the existence of solutions, which exist globally, and are L∞-bounded on
finite time intervals. The hypotheses require nonlocal conditions on the species-induced
production of the chemoattractant.
A classical result on the existence of global attractors for gradient systems is extended to the case of a semigroup S(t) lacking strong continuity, but satisfying the weaker property of being a closed map for every fixed t ≥ 0.
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