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Displaying 441 – 460 of 1530

On enveloping semigroups of nilpotent group actions generated by unipotent affine transformations of the torus

Rafał Pikuła (2010)

Studia Mathematica

Let G be a group generated by a set of affine unipotent transformations T: X → X of the form T(x) = A x + α, where A is a lower triangular unipotent matrix, α is a constant vector, and X is a finite-dimensional torus. We show that the enveloping semigroup E(X,G) of the dynamical system (X,G) is a nilpotent group and find upper and lower bounds on its nilpotency class. Also, we obtain a description of E(X,G) as a quotient space.

On equalizers in the category of frames with weakly open homomorphisms

Josef Niederle (1992)

Czechoslovak Mathematical Journal

On equivalence of some iterations convergence for quasi-contraction maps in convex metric spaces.

Xue, Zhiqun, Lv, Guiwen, Rhoades, B.E. (2010)

Fixed Point Theory and Applications [electronic only]

On Ergodic Averages for Affine Lattice Actions on Tori.

S.G. Dani, S. Muralidharan (1983)

Monatshefte für Mathematik

On essential ring embeddings and the epimorphic hull of $C (X)$ .

Raphael, R., Woods, R.G. (2005)

Theory and Applications of Categories [electronic only]

On evolution of small spheres in the phase space of a dynamical system*

Boris Gurevich, Sergei Komech (2012)

ESAIM: Proceedings

We study the connection between the entropy of a dynamical system and the boundary distortion rate of regions in the phase space of the system.

On existence and uniqueness of Chebyshev center of bounded set in a special geodesic space.

Sosov, E.N. (2000)

Lobachevskii Journal of Mathematics

On existence of equilibrium pair for constrained generalized games.

Srinivasan, P.S., Veeramani, P. (2004)

Fixed Point Theory and Applications [electronic only]

On expansions of a Urysohn space to a regular space.

Mary Powderly (1973)

Journal für die reine und angewandte Mathematik

On expansiveness of shift homeomorphisms of inverse limits of graphs

Hisao Kato (1991)

Fundamenta Mathematicae

On extended frames

Jorge Picado (1995)

Commentationes Mathematicae Universitatis Carolinae

Some aspects of extended frames are studied, namely, the behaviour of ideals, covers, admissible systems of covers and uniformities.

On extending $C^{k}$ functions from an open set to $ℝ$ with applications

Walter D. Burgess, Robert M. Raphael (2023)

Czechoslovak Mathematical Journal

For $k \in ℕ \cup {\infty}$ and $U$ open in $ℝ$ , let $C^{k} (U)$ be the ring of real valued functions on $U$ with the first $k$ derivatives continuous. It is shown that for $f \in C^{k} (U)$ there is $g \in C^{\infty} (ℝ)$ with $U \subseteq coz g$ and $h \in C^{k} (ℝ)$ with ${f g |}_{U} {= h |}_{U}$ . The function $f$ and its $k$ derivatives are not assumed to be bounded on $U$ . The function $g$ is constructed using splines based on the Mollifier function. Some consequences about the ring $C^{k} (ℝ)$ are deduced from this, in particular that $Q_{cl} (C^{k} (ℝ)) = Q (C^{k} (ℝ))$ .

On extending homeomorphisms on zero-dimensional spaces

Jean Pollard (1970)

Fundamenta Mathematicae

On extending transitive homeomorphisms from the Cantor set to the product of two Cantor sets

Ryszard Frankiewicz, Andrzej Gutek (1981)

Commentationes Mathematicae Universitatis Carolinae

On extension of functors

L. Karchevska, Taras Radul (2012)

Commentationes Mathematicae Universitatis Carolinae

A. Chigogidze defined for each normal functor on the category Comp an extension which is a normal functor on the category Tych. We consider this extension for any functor on the category Comp and investigate which properties it preserves from the definition of normal functor. We investigate as well some topological properties of such extension.

On Extension of Functors onto the Kleisli Category of the Inclusion Hyperspace Monad

Teleiko, Andrii (1998)

Serdica Mathematical Journal

It is proved that there exists no extension of any non-trivial weakly normal functor of finite degree onto the Kleisli category of the inclusion hyperspace monad.

On extension of functors to the Kleisli category of some weakly normal monads

Andrii Teleiko (1996)

Commentationes Mathematicae Universitatis Carolinae

The problem of extension of normal functors to the Kleisli categories of the inclusion hyperspace monad and its submonads is considered. Some negative results are obtained.

On extension of pairwise $Θ$ -continuous maps.

Sen, S.K., Mukherjee, M.N. (1996)

International Journal of Mathematics and Mathematical Sciences

On extension of the group operation over the Čech-Stone compactification

Jan Jełowicki (1993)

Colloquium Mathematicae

The convolution of ultrafilters of closed subsets of a normal topological group is considered as a substitute of the extension onto ${(β)}^{2}$ of the group operation. We find a subclass of ultrafilters for which this extension is well-defined and give some examples of pathologies. Next, for a given locally compact group and its dense subgroup , we construct subsets of β algebraically isomorphic to . Finally, we check whether the natural mapping from β onto β is a homomorphism with respect to the extension...

On extensions of fuzzy topologies

Ganesan Balasubramanian (1992)

Kybernetika

Currently displaying 441 – 460 of 1530

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