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We prove that self-similar measures on the real line are absolutely continuous for almost all parameters in the super-critical region, in particular confirming a conjecture of S-M. Ngai and Y. Wang. While recently there has been much…

Dynamical Systems · Mathematics 2024-09-24 Santiago Saglietti , Pablo Shmerkin , Boris Solomyak

We study finitely additive extensions of the asymptotic density to all the subsets of natural numbers. Such measures are called density measures. We consider a class of density measures constructed from free ultrafilters on $\mathbb{N}$ and…

Number Theory · Mathematics 2016-01-26 Ryoichi Kunisada

A class of piecewise affine hyperbolic maps on a bounded subset of the plane is considered. It is shown that if a map from this class is sufficiently area-expanding then almost surely this map has an absolutely continuous invariant measure.

Dynamical Systems · Mathematics 2007-05-23 Tomas Persson

Consider a measurable space with an atomless finite vector measure. This measure defines a mapping of the $\sigma$-field into an Euclidean space. According to the Lyapunov convexity theorem, the range of this mapping is a convex compactum.…

Probability · Mathematics 2011-02-14 Peng Dai , Eugene A. Feinberg

Consider an iterated function system consisting of similarities on the complex plane of the form $g_{i}(z) = \lambda_i z + t_i,\ \lambda_i, t_i \in \mathbb{C},\ |\lambda_i|<1, i=1,\ldots, k$. We prove that for almost every choice of…

Dynamical Systems · Mathematics 2023-08-31 Boris Solomyak , Adam Śpiewak

We study the pointwise dimension for a new class of projection measures on arbitrary fractal limit sets without separation conditions. We prove that the pointwise dimension exists a.e. for this class of measures associated to equilibrium…

Dynamical Systems · Mathematics 2019-08-28 Eugen Mihailescu

In this paper we extend our findings in [3] and answer further questions regarding continuity and discontinuity of seminorms on infinite-dimensional vector spaces.

Functional Analysis · Mathematics 2020-03-10 Jacek Chmieliński , Moshe Goldberg

We give a condition for absolute continuity of self-similar measures in arbitrary dimensions. This allows us to construct the first explicit absolutely continuous examples of inhomogeneous self-similar measures in dimension one and two. In…

Dynamical Systems · Mathematics 2025-10-20 Samuel Kittle , Constantin Kogler

The prime objective of this paper is to develop the notion of absolute continuity of functions on a more general setting outside $\R$. For this we have considered a topological space which is a measure space as well. We have built axioms…

Functional Analysis · Mathematics 2022-09-15 Dhruba Prakash Biswas , Sandip Jana

We show that a dissipative, ergodic measure preserving transformation of a sigma-finite, non-atomic measure space always has many non-proportional, absolutely continuous, invariant measures and is ergodic with respect to each one of these.

Dynamical Systems · Mathematics 2010-06-01 Jon. Aaronson , Tom Meyerovitch

Let $S$ be a seminorm on an infinite-dimensional real or complex vector space $X$. Our purpose in this note is to study the continuity and discontinuity properties of $S$ with respect to certain norm-topologies on $X$.

Functional Analysis · Mathematics 2019-04-23 Jacek Chmieliński , Moshe Goldberg

We study measures defined on effect algebras. We characterize real-valued measures on effect algebras and find a class of effect algebras, that include the natural effect algebras of sets, on which sigma-additive measures with values in a…

Functional Analysis · Mathematics 2024-02-12 Giuseppina Barbieri , Francisco Javier García-Pacheco , Soledad Moreno-Pulido

In this paper we classify all topological vector spaces with linear topology with the property that all algebraic automorphisms are continuous. Moreover, we prove some properties of these spaces.

General Topology · Mathematics 2026-03-02 Samuel Quirino , Lucas H. R. de Souza

Quasi-invariant and pseudo-differentiable measures on a Banach space $X$ over a non-Archimedean locally compact infinite field with a non-trivial valuation are defined and constructed. Measures are considered with values in non-Archimedean…

General Mathematics · Mathematics 2007-05-23 Sergey V. Ludkovsky

A general construction for $\sigma-$finite absolutely continuous invariant measure will be presented. It will be shown that the local bounded distortion of the Radon-Nykodym derivatives of $f^n_*(\lambda)$ will imply the existence of a…

Dynamical Systems · Mathematics 2016-09-06 Marco Martens

In this work the problem about an existence of non-measurable automorphisms of Lie groups finite and as well infinite dimensional over the field of real numbers and also over the non-archimedean local fields is investigated.…

Functional Analysis · Mathematics 2018-12-18 S. V. Ludkovsky

We give the detale description from various points of view of Pascal automorphism,--- a natural transformation of the space of paths in the Pascal graph (= infinite Pascal triangle), and describetha plan of the proof of continuiuty of its…

Dynamical Systems · Mathematics 2011-09-01 A. Vershik

Quasi-invariant and pseudo-differentiable measures on a Banach space $X$ over a non-Archimedean locally compact infinite field with a non-trivial valuation are defined and constructed. Measures are considered with values in $\bf R$.…

General Mathematics · Mathematics 2007-05-23 Sergey V. Ludkovsky

We describe the Segal $K$-theory of the symmetric monoidal category of finite-dimensional vector spaces over a perfect field $\mathbb{F}$ together with an automorphism, or, equivalently, the group-completion of the $E_\infty$-algebra of…

K-Theory and Homology · Mathematics 2024-10-21 Andrea Bianchi , Florian Kranhold

The theory of integration over infinite-dimensional spaces is known to encounter serious difficulties. Categorical ideas seem to arise naturally on the path to a remedy. Such an approach was suggested and initiated by Segal in his…

Probability · Mathematics 2012-11-13 Igor Kriz , Ales Pultr
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