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    Wyświetlanie 1-9 z 9
    Tytuł:
    Optimal factors in Vladimir Markovs inequality in L2 norm
    Autorzy:
    Baran, M.
    Kowalska, A.
    Ozorka, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/93076.pdf
    Data publikacji:
    2018
    Wydawca:
    Państwowa Wyższa Szkoła Zawodowa w Tarnowie
    Tematy:
    Markov inequality
    L2 norm
    nierówność Markowa
    norma L2
    Opis:
    In this paper we discuss a problem of computation of constants in Vladimir Markov's type inequality in L2 norm on the interval [-1, 1].
    Źródło:
    Science, Technology and Innovation; 2018, 2, 1; 64-73
    2544-9125
    Pojawia się w:
    Science, Technology and Innovation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On Vladimir Markov type inequality in Lp norms on the interval [-1; 1]
    Autorzy:
    Baran, Mirosław
    Ozorka, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/93082.pdf
    Data publikacji:
    2019
    Wydawca:
    Państwowa Wyższa Szkoła Zawodowa w Tarnowie
    Tematy:
    Vladimir Markov type inequality
    Lp-norm
    nierówności typu Władimira Markowa
    norma Lp
    Opis:
    We prove inequality ||P(k)||Lp(-1;1)≤Bp||Tn(k)||Lp(-1;1)n^(2/p) ||P||Lp(-1;1); where Bp are constants independent of n = deg P with 1 ≤ p ≤ 2, which is sharp in the case k ≥ 3. A method presented in this note is based on a factorization of linear operator of k-th derivative throughout normed spaces of polynomial equipped with a Wiener type norm.
    Źródło:
    Science, Technology and Innovation; 2019, 7, 4; 9-12
    2544-9125
    Pojawia się w:
    Science, Technology and Innovation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Convolutions, integral transforms and integral equations by means of the theory of reproducing kernels
    Autorzy:
    Castro, L. P.
    Saitoh, S.
    Tuan, N. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/256011.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    Hilbert space
    linear transform
    reproducing kernel
    linear mapping
    convolution
    norm inequality
    integral equation
    Tikhonov regularization
    Opis:
    This paper introduces a general concept of convolutions by means of the theory of reproducing kernels which turns out to be useful for several concrete examples and applications. Consequent properties are exposed (including, in particular, associated norm inequalities).
    Źródło:
    Opuscula Mathematica; 2012, 32, 4; 633-646
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A variant sharp estimate for multilinear singular integral operators
    Autorzy:
    Hu, Guoen
    Yang, Dachun
    Powiązania:
    https://bibliotekanauki.pl/articles/1206036.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    multilinear singular integral operator
    BMO
    weighted norm inequality
    sharp estimate
    Opis:
    We establish a variant sharp estimate for multilinear singular integral operators. As applications, we obtain the weighted norm inequalities on general weights and certain $Llog^{+}L$ type estimates for these multilinear operators.
    Źródło:
    Studia Mathematica; 2000, 141, 1; 25-22
    0039-3223
    Pojawia się w:
    Studia Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two-weight norm inequalities for maximal functions on homogeneous spaces and boundary estimates
    Autorzy:
    Luís Zani, Sérgio
    Powiązania:
    https://bibliotekanauki.pl/articles/1219073.pdf
    Data publikacji:
    1997
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    norm inequality
    weight
    maximal function
    homogeneous space
    Opis:
    Let D be an open subset of a homogeneous space(X,d,μ). Consider the maximal function $M_φ f(x) = sup1/φ(B) ʃ_{B∩∂D} |f|dν$, x∈ D, where the supremum is taken over all balls of the form B = B(a(x),r) with r > t(x) = d(x,∂D), a(x)∈ ∂D is such that d(a(x),x) < 3/2 t(x)$ and φ is a nonnegative set function defined for all Borel sets of X satisfying the quasi-monotonicity and doubling properties. We give a necessary and sufficient condition on the weights w and v for the weighted norm inequality (0.1) $(ʃ_D [M_φ(f)]^q wdμ)^{1/q} ≤ c(ʃ_{∂D} |f|^p vdν)^{1/p}$ to hold when 1 < p < q < ∞, $σdν = v^{1-p'}dν$ is a doubling weight, and dν is a doubling measure, and give a sufficient condition for (0.1) when 1 < p ≤ q < ∞ without assuming that σ is a doubling weight but with an extra assumption on φ. Another characterization for (0.1) is also provided for 1 < p ≤ q < ∞ and D of the form Y×(0,∞), where Y is a homogeneous space with group structure. These results generalize some known theorems in the case when $M_φ$ is the fractional maximal function in $ℝ^{n+1}_+$, that is, when $M_φ f(x,t) = M_γ f(x,t) = sup_{r>t} 1/(ν(B(x,r))^{1-γ}) ʃ_{B(x,r)} |f|dν$, where $(x,t) ∈ ℝ^{n+1}_+$, 0 < γ < 1, and ν is a doubling measure in $ℝ^n$.
    Źródło:
    Studia Mathematica; 1997, 126, 1; 67-94
    0039-3223
    Pojawia się w:
    Studia Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conjugate functions, lp-norm like functionals, the generalized Hölder inequality, Minkowski inequality and subhomogeneity
    Autorzy:
    Matkowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/255030.pdf
    Data publikacji:
    2014
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    Lp-norm like functional
    homogeneity
    subhomogeneity
    subadditivity
    Minkowski inequality
    Hölder inequality
    converses
    generalization of the Minkowski and Hölder inequalities
    conjugate functions
    complementary functions
    Young conjugate functions
    convex function
    geometrically convex function
    Wright convex function
    functional equation
    Opis:
    For h : (0,∞) → R, the function h* (t) := th( 1/t ) is called (*)-conjugate to h. This conjugacy is related to the Hölder and Minkowski inequalities. Several properties of (*)-conjugacy are proved. If φ and φ* are bijections of (0,∞) then [formula]. Under some natural rate of growth conditions at 0 and ∞, if φ is increasing, convex, geometrically convex, then [formula] has the same properties. We show that the Young conjugate functions do not have this property. For a measure space (Ω,Σ,μ) denote by S = (Ω,Σ,μ) the space of all μ-integrable simple functions x : Ω → R, Given a bijection φ : (0,∞) → (0,∞) define [formula] by [formula] where Ω(x) is the support of x. Applying some properties of the (*) operation, we prove that if ƒ xy ≤ Pφ(x)Pψ (y) where [formula] and [formula] are conjugate, then φ and ψ are conjugate power functions. The existence of nonpower bijections φ and ψ with conjugate inverse functions [formula] such that Pφ and Pψ are subadditive and subhomogeneous is considered.
    Źródło:
    Opuscula Mathematica; 2014, 34, 3; 523-560
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Convex-like inequality, homogeneity, subadditivity, and a characterization of $L^p$-norm
    Autorzy:
    Matkowski, Janusz
    Pycia, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/1311612.pdf
    Data publikacji:
    1995
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    functional inequality
    subadditive functions
    homogeneous functions
    Banach functionals
    convex functions
    linear space
    cones
    measure space
    integrable step functions
    $L^p$-norm
    Minkowski's inequality
    Opis:
    Let a and b be fixed real numbers such that 0 < min{a,b} < 1 < a + b. We prove that every function f:(0,∞) → ℝ satisfying f(as + bt) ≤ af(s) + bf(t), s,t > 0, and such that $limsup_{t → 0+} f(t) ≤ 0$ must be of the form f(t) = f(1)t, t > 0. This improves an earlier result in [5] where, in particular, f is assumed to be nonnegative. Some generalizations for functions defined on cones in linear spaces are given. We apply these results to give a new characterization of the $L^p$-norm.
    Źródło:
    Annales Polonici Mathematici; 1994-1995, 60, 3; 221-230
    0066-2216
    Pojawia się w:
    Annales Polonici Mathematici
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the exponential Orlicz norms of stopped Brownian motion
    Autorzy:
    Peškir, Goran
    Powiązania:
    https://bibliotekanauki.pl/articles/1288072.pdf
    Data publikacji:
    1996
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    Brownian motion (Wiener process)
    stopping time
    exponential Young function
    exponential Orlicz norm
    Doob's maximal inequality for martingales
    Burkholder-Gundy's inequality
    Davis' best constants
    Hermite polynomial
    continuous (local) martingale
    Ito's integral
    the quadratic variation process
    time change (of Brownian motion)
    Kahane-Khinchin's inequalities
    Opis:
    Necessary and sufficient conditions are found for the exponential Orlicz norm (generated by $ψ_p(x) = exp(|x|^p)-1$ with 0 < p ≤ 2) of $max_{0≤t≤τ}|B_t|$ or $|B_τ|$ to be finite, where $B = (B_t)_{t≥0}$ is a standard Brownian motion and τ is a stopping time for B. The conditions are in terms of the moments of the stopping time τ. For instance, we find that $∥max_{0≤t≤τ}|B_t|∥_{ψ_1} < ∞$ as soon as $E(τ^{k}) = O(C^{k}k^{k})$ for some constant C > 0 as k → ∞ (or equivalently $∥τ∥_{ψ_1} < ∞$). In particular, if τ ∼ Exp(λ) or $|N(0,σ^2)|$ then the last condition is satisfied, and we obtain $∥max_{0≤t≤τ}|B_t|∥_{ψ_1} ≤ K √{E(τ)}$ with some universal constant K > 0. Moreover, this inequality remains valid for any class of stopping times τ for B satisfying $E(τ^{k}) ≤ C(Eτ)^{k}k^{k}$ for all k ≥ 1 with some fixed constant C > 0. The method of proof relies upon Taylor expansion, Burkholder-Gundy's inequality, best constants in Doob's maximal inequality, Davis' best constants in the $L^p$-inequalities for stopped Brownian motion, and estimates of the smallest and largest positive zero of Hermite polynomials. The results extend to the case of any continuous local martingale (by applying the time change method of Dubins and Schwarz).
    Źródło:
    Studia Mathematica; 1995-1996, 117, 3; 253-273
    0039-3223
    Pojawia się w:
    Studia Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Weak type estimates for operators of potential type
    Autorzy:
    Wheeden, Richard L.
    Zhao, Shiying
    Powiązania:
    https://bibliotekanauki.pl/articles/1287570.pdf
    Data publikacji:
    1996
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    norm inequality
    weight
    operator of potential type
    homogeneous space
    Opis:
    We derive two-weight weak type estimates for operators of potential type in homogeneous spaces. The conditions imposed on the weights are testing conditions of the kind first studied by E. T. Sawyer [4]. We also give some applications to strong type estimates as well as to operators on half-spaces.
    Źródło:
    Studia Mathematica; 1996, 119, 2; 149-160
    0039-3223
    Pojawia się w:
    Studia Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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