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On the homeomorphism groups of manifolds and their universal coverings

100%

Kowalik A., Rybicki T.

Open Mathematics

2011

tom 9

nr 6

1217-1231

Let H c(M) stand for the path connected identity component of the group of all compactly supported homeomorphisms of a manifold M. It is shown that H c(M) is perfect and simple under mild assumptions on M. Next, conjugation-invariant norms on Hc(M) are considered and the boundedness of Hc(M) and its subgroups is investigated. Finally, the structure of the universal covering group of Hc(M) is studied.

Positivity and contractivity in the dynamics of clusters’ splitting with derivative of fractional order

100%

Goufo E. F. D., Mugisha S.

Open Mathematics

2015

tom 13

nr 1

Classical models of clusters’ fission have failed to fully explain strange phenomenons like the phenomenon of shattering (Ziff et al., 1987) and the sudden appearance of infinitely many particles in some systems with initial finite particles number. Furthermore, the bounded perturbation theorem presented in (Pazy, 1983) is not in general true in solution operators theory for models of fractional order γ (with 0 < γ ≤ 1). In this article, we introduce and study a model that can be understood as the fractional generalization of the clusters’ fission process.We make use of the theory of strongly continuous solution operators for fractional models (analogues of C0-semigroups for classical models) and the subordination principle for fractional evolution equations (Bazhlekova, 2000, Prüss, 1993) to analyze and show existence results for clusters’ splitting model with derivative of fractional order. In the process, we exploit some properties of Mittag-Leffler relaxation function (Berberan-Santos, 2005), the He’s homotopy perturbation (He, 1999) and Kato’s type perturbation (Banasiak, 2006) methods. The Cauchy problem for multiplication operator in the fractional dynamics is first considered, before we perturb it. Some additional concepts like Laplace transform, Hille-Yosida theorem and the dominated convergence theorem are use to finally show that there is a solution operator to the full fractional model that is positive and contractive.

Ograniczanie wyników

2 Open Mathematics

1 Goufo E. F. D.

1 Kowalik A.

1 Mugisha S.

1 Rybicki T.

1 2015

1 2011

Wyniki wyszukiwania

On the homeomorphism groups of manifolds and their universal coverings

Positivity and contractivity in the dynamics of clusters’ splitting with derivative of fractional order