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Wyszukujesz frazę "measure" wg kryterium: Temat


Wyświetlanie 1-13 z 13
Tytuł:
Sur les dimensions de mesures
Autorzy:
Hua Fan, Ai
Powiązania:
https://bibliotekanauki.pl/articles/1290182.pdf
Data publikacji:
1994
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
upper and lower dimension
dimension formulas
unidimensional
multifractal
Gibbs measure
Markov measure
Riesz product
Opis:
Firstly, we introduce the lower and upper dimensions for a measure defined on a metric space. Secondly, we establish the dimension formulas and characterize the unidimensional measures which were introduced by J.-P. Kahane. Lastly, we give some applications of these to the calculus of dimensions and the multifractal analysis of certain well known measures such as Lebesgue measures on Cantor sets, Gibbs measures, Markov measures and Riesz products etc.
Źródło:
Studia Mathematica; 1994, 111, 1; 1-17
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Fourier analytical characterization of the Hausdorff dimension of a closed set and of related Lebesgue spaces
Autorzy:
Triebel, Hans
Winkelvoss, Heike
Powiązania:
https://bibliotekanauki.pl/articles/1221048.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Hausdorff dimension
Hausdorff measure
function spaces
Opis:
Let Γ be a closed set in $ℝ^n$ with Lebesgue measure |Γ| = 0. The first aim of the paper is to give a Fourier analytical characterization of Hausdorff dimension of Γ. Let 0 < d < n. If there exist a Borel measure µ with supp µ ⊂ Γ and constants $c_{1} > 0$ and $c_{2} > 0$ such that $c_{1}r^{d} ≤ µ (B(x,r)) ≤ c_{2}r^{d}$ for all 0 < r < 1 and all x ∈ Γ, where B(x,r) is a ball with centre x and radius r, then Γ is called a d-set. The second aim of the paper is to provide a link between the related Lebesgue spaces $L_{p}(Γ)$, 0 < p ≤ ∞, with respect to that measure µ on the hand and the Fourier analytically defined Besov spaces $B^s_{p,q}(ℝ^n)$ (s ∈ ℝ, 0 < p ≤ ∞, 0 < q ≤ ∞) on the other hand.
Źródło:
Studia Mathematica; 1996, 121, 2; 149-166
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pointwise multipliers for reverse Holder spaces
Autorzy:
M. Buckley, Stephen
Powiązania:
https://bibliotekanauki.pl/articles/1290583.pdf
Data publikacji:
1994
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
reverse Hölder condition
maximal function
weight
doubling measure
Opis:
We classify weights which map reverse Hölder weight spaces to other reverse Hölder weight spaces under pointwise multiplication. We also give some fairly general examples of weights satisfying weak reverse Hölder conditions.
Źródło:
Studia Mathematica; 1994, 109, 1; 23-39
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metric entropy of convex hulls in Hilbert spaces
Autorzy:
Li, Wenbo V.
Linde, Werner
Powiązania:
https://bibliotekanauki.pl/articles/1206124.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
metric entropy
convex hull
majorizing measure
Gaussian process
Opis:
Let T be a precompact subset of a Hilbert space. We estimate the metric entropy of co(T), the convex hull of T, by quantities originating in the theory of majorizing measures. In a similar way, estimates of the Gelfand width are provided. As an application we get upper bounds for the entropy of co(T), $T={t_1,t_2,...}$, $||t_j||≤a_j$, by functions of the $a_j$'s only. This partially answers a question raised by K. Ball and A. Pajor (cf. [1]). Our estimates turn out to be optimal in the case of slowly decreasing sequences $(a_j)_{j=1}^∞$.
Źródło:
Studia Mathematica; 2000, 139, 1; 29-45
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Existence, uniqueness and ergodicity for the stochastic quantization equation
Autorzy:
Gątarek, Dariusz
Gołdys, Beniamin
Powiązania:
https://bibliotekanauki.pl/articles/1287572.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Wick powers
Nelson estimates
stochastic quantization
stationary measure
ergodicity
Opis:
Existence, uniqueness and ergodicity of weak solutions to the equation of stochastic quantization in finite volume is obtained as a simple consequence of the Girsanov theorem.
Źródło:
Studia Mathematica; 1996, 119, 2; 179-193
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Factorization through Hilbert space and the dilation of L(X,Y)-valued measures
Autorzy:
Mandrekar, V.
P., P.
Powiązania:
https://bibliotekanauki.pl/articles/1292450.pdf
Data publikacji:
1993
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
spectral dilation of operator-valued measure
Hilbertian operators
factorization
Opis:
We present a general necessary and sufficient algebraic condition for the spectral dilation of a finitely additive L(X,Y)-valued measure of finite semivariation when X and Y are Banach spaces. Using our condition we derive the main results of Rosenberg, Makagon and Salehi, and Miamee without the assumption that X and/or Y are Hilbert spaces. In addition we relate the dilation problem to the problem of factoring a family of operators through a single Hilbert space.
Źródło:
Studia Mathematica; 1993, 107, 2; 101-113
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Invariant densities for C¹ maps
Autorzy:
N. Quas, Anthony
Powiązania:
https://bibliotekanauki.pl/articles/1287383.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
cocycle
expanding map
invariant density
absolutely continuous invariant measure
Opis:
We consider the set of $C^1$ expanding maps of the circle which have a unique absolutely continuous invariant probability measure whose density is unbounded, and show that this set is dense in the space of $C^1$ expanding maps with the $C^1$ topology. This is in contrast with results for $C^2$ or $C^{1+ε}$ maps, where the invariant densities can be shown to be continuous.
Źródło:
Studia Mathematica; 1996, 120, 1; 83-88
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The higher order Riesz transform for Gaussian measure need not be of weak type (1,1)
Autorzy:
Forzani, Liliana
Scotto, Roberto
Powiązania:
https://bibliotekanauki.pl/articles/1217692.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Fourier analysis
Gaussian measure
Poisson-Hermite integrals
Hermite expansions
Opis:
The purpose of this paper is to prove that the higher order Riesz transform for Gaussian measure associated with the Ornstein-Uhlenbeck differential operator $L:= d^2//dx^2 - 2xd//dx$, x ∈ ℝ, need not be of weak type (1,1). A function in $L^1(dγ)$, where dγ is the Gaussian measure, is given such that the distribution function of the higher order Riesz transform decays more slowly than C/λ.
Źródło:
Studia Mathematica; 1998, 131, 3; 205-214
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Almost 1-1 extensions of Furstenberg-Weiss type and applications to Toeplitz flows
Autorzy:
Downarowicz, T.
Lacroix, Y.
Powiązania:
https://bibliotekanauki.pl/articles/1218333.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
almost 1-1 extension
invariant measure
isomorphism
Toeplitz flow
Opis:
Let $(Z,T_Z)$ be a minimal non-periodic flow which is either symbolic or strictly ergodic. Any topological extension of $(Z,T_Z)$ is Borel isomorphic to an almost 1-1 extension of $(Z,T_Z)$. Moreover, this isomorphism preserves the affine-topological structure of the invariant measures. The above extends a theorem of Furstenberg-Weiss (1989). As an application we prove that any measure-preserving transformation which admits infinitely many rational eigenvalues is measure-theoretically isomorphic to a strictly ergodic toeplitz flow.
Źródło:
Studia Mathematica; 1998, 130, 2; 149-170
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
$L^q$-spectrum of the Bernoulli convolution associated with the golden ratio
Autorzy:
Lau, Ka-Sing
Ngai, Sze-Man
Powiązania:
https://bibliotekanauki.pl/articles/1217803.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Bernoulli convolution
golden ratio
multifractal measure
$L^q$-spectrum
$L^q$-dimension
Hausdorff dimension
renewal equation
self-similarity
Opis:
Based on a set of higher order self-similar identities for the Bernoulli convolution measure for (√5-1)/2 given by Strichartz et al., we derive a formula for the $L^q$-spectrum, q >0, of the measure. This formula is the first obtained in the case where the open set condition does not hold.
Źródło:
Studia Mathematica; 1998, 131, 3; 225-251
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pointwise ergodic theorems for functions in Lorentz spaces $L_{pq}$ with p ≠ ∞
Autorzy:
Sato, Ryotaro
Powiązania:
https://bibliotekanauki.pl/articles/1290543.pdf
Data publikacji:
1994
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
pointwise ergodic theorems
$L_{pq}$ spaces
null preserving transformations
measure preserving transformations
positive contractions on $L_1$ spaces
Opis:
Let τ be a null preserving point transformation on a finite measure space. Assuming τ is invertible, P. Ortega Salvador has recently obtained sufficient conditions for the almost everywhere convergence of the ergodic averages in $L_{pq}$ with 1 < p < ∞, 1 < q < ∞. In this paper we obtain necessary and sufficient conditions for the almost everywhere convergence, without assuming that τ is invertible and only assuming that p ≠ ∞.
Źródło:
Studia Mathematica; 1994, 109, 2; 209-216
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The converse of the Hölder inequality and its generalizations
Autorzy:
Matkowski, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/1290537.pdf
Data publikacji:
1994
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
measure space
integrable step functions
conjugate functions
a converse of Hölder inequality
subadditive function
convex function
generalized Hölder-Minkowski inequality
Opis:
Let (Ω,Σ,μ) be a measure space with two sets A,B ∈ Σ such that 0 < μ (A) < 1 < μ (B) < ∞ and suppose that ϕ and ψ are arbitrary bijections of [0,∞) such that ϕ(0) = ψ(0) = 0. The main result says that if $ʃ_Ω xydμ ≤ ϕ^{-1} (\int_{Ω} ϕ∘x dμ) ψ^{-1} (\int_{Ω} ψ∘x dμ)$ for all μ-integrable nonnegative step functions x,y then ϕ and ψ must be conjugate power functions. If the measure space (Ω,Σ,μ) has one of the following properties: (a) μ (A) ≤ 1 for every A ∈ Σ of finite measure; (b) μ (A) ≥ 1 for every A ∈ Σ of positive measure, then there exist some broad classes of nonpower bijections ϕ and ψ such that the above inequality holds true. A general inequality which contains integral Hölder and Minkowski inequalities as very special cases is also given.
Źródło:
Studia Mathematica; 1994, 109, 2; 171-182
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new convexity property that implies a fixed point property for $L_{1}$
Autorzy:
Lennard, Chris
Powiązania:
https://bibliotekanauki.pl/articles/1293465.pdf
Data publikacji:
1991
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
uniform Kadec-Klee property
convergence in measure compact sets
convex sets
normal structure
Lebesgue function spaces
fixed point
nonexpansive mapping
Chebyshev centre
Opis:
In this paper we prove a new convexity property for L₁ that resembles uniform convexity. We then develop a general theory that leads from the convexity property through normal structure to a fixed point property, via a theorem of Kirk. Applying this theory to L₁, we get the following type of normal structure: any convex subset of L₁ of positive diameter that is compact for the topology of convergence locally in measure, must have a radius that is smaller than its diameter. Indeed, a stronger result holds. The Chebyshev centre of any norm bounded, convergence locally in measure compact subset of L₁ must be norm compact. Immediately from normal structure, we get a new proof of a fixed point theorem for L₁ due to Lami Dozo and Turpin.
Źródło:
Studia Mathematica; 1991, 100, 2; 95-108
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-13 z 13

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