Function of Bounded Variation

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Rate of convergence of bounded variation functions by a Bézier Durrmeyer variant of the Baskakov operators

Rate of convergence of bounded variation functions by a Bézier Durrmeyer variant of the Baskakov operators

Theorem 2.1 . Assume that f ∈ W (0, ∞ ) is a function of bounded variation on every finite subinterval of (0, ∞ ). Furthermore, let α ≥ 1, λ > 2, and x ∈ (0, ∞ ) be given. Then, for each r ∈ N , there exists a constant M(f , α, r , x) such that for sufficiently large n, the Bézier–type Baskakov-Durrmeyer operators V n,α satisfy the estimate

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Applications of Some Classes of Sequences on Approximation of Functions (Signals) by Almost Generalized Nörlund Means of Their Fourier Series

Applications of Some Classes of Sequences on Approximation of Functions (Signals) by Almost Generalized Nörlund Means of Their Fourier Series

Abstract. In this paper, using rest bounded variation sequences and head bounded variation sequences, some new results on approximation of function- s (signals) by almost generalized N¨ orlund means of their Fourier series are obtained. To our best knowledge this the first time to use such classes of sequences on approximations of the type treated in this paper. In addition, several corollaries are derived from our results as well as those obtained pre- viously by others.

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Uniformly Bounded Set Valued Composition Operators in the Spaces of Functions of Bounded Variation in the Sense of Riesz

Uniformly Bounded Set Valued Composition Operators in the Spaces of Functions of Bounded Variation in the Sense of Riesz

RV ϕ I C = f ∈ RV ϕ I X f I ∈ C (20) Theorem 3.1. Let ( X , ⋅ ) be a real normed space, ( Y , ⋅ ) a real Banach space, C ⊂ X a convex cone, I ⊂  an arbitrary interval and let ϕ ψ ∈ ,  . Suppose that set-valued function h I : × → C clb Y ( ) is such that, for any t ∈ I the function h t ( ) , : ⋅ C → clb Y ( ) is continuous with respect to the second variable. If the composition operator H generated by the set-valued function h maps RW ϕ ( I C , ) into RW ψ ( I clb Y , ( ) ) , and satisfies the inequality

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Restrictions of holder continuous functions

Restrictions of holder continuous functions

Abstract. For 0 < α < 1 let V (α) denote the supremum of the numbers v such that every α-H¨ older continuous function is of bounded variation on a set of Hausdorff dimension v. Kahane and Katznelson (2009) proved the estimate 1/2 ≤ V (α) ≤ 1/(2−α) and asked whether the upper bound is sharp. We show that in fact V (α) = max{1/2, α}. Let dim H and dim M denote the Hausdorff

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Classes of functions associated with bounded Mocanu variation

Classes of functions associated with bounded Mocanu variation

In the paper we introduce the class of linear combinations of functions which are subordinated to a convex function. Some relationships between this class and the class of real-valued functions with bounded variation on [0, 2 π ] are obtained. Next, we define classes of functions associated with bounded Mocanu variation. By using the properties of multivalent prestarlike functions, we obtain various inclusion relationships between defined classes of functions. Some applications of the main results are also considered.

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Some Inequalities for Functions of Bounded Variation with Applications to Landau Type Results

Some Inequalities for Functions of Bounded Variation with Applications to Landau Type Results

Abstract. Some inequalities for functions of bounded variation that provide reverses for the inequality between the integral mean and the p−norm for p ∈ [1, ∞] are established. Applications related to the celebrated Landau inequality between the norms of the derivatives of a function are also pointed out.

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Ostrowski type inequalities for sets and functions of bounded variation

Ostrowski type inequalities for sets and functions of bounded variation

Inequalities that estimate deviation of a function from its mean value using different characteristics of the function are usually called Ostrowski type inequalities. Such inequal- ities have many applications, in particular in the area of numerical methods, and are heav- ily studied. See [] and the references therein for results connected with Ostrowski type inequalities for univariate functions of bounded variation and their applications.

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A companion of Ostrowski's inequality for functions of bounded variation and applications

A companion of Ostrowski's inequality for functions of bounded variation and applications

Recently, Guessab and Schmeisser [23], in the effort of incorporating together the mid-point and trapezoid inequality, have proved amongst others, the following companion of Ostrowski’s inequality. Theorem 1.3. Assume that the function f : [a, b] → R is of H − r−H¨ older type with r ∈ (0, 1], i.e., |f (t) − f (s)| ≤ H |t − s| r f oranyt, s ∈ [a, b] . (1.3) Then, for each x ∈

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On Ostrowski Type Inequalities for Functions of Two Variables with Bounded Variation

On Ostrowski Type Inequalities for Functions of Two Variables with Bounded Variation

Definition 3. (Hardy-Krause). The function f (x, y) is said tobe of bounded variation if it satisfies the condition of Definition 1 and if in addition f (x, y) is of bounded variation in y (i.e. φ(x) is finite) for at least one x and f(x, y) is of bounded variation in y (i.e. ψ(y) is finite) for at least one y. Definition 4. (Arzel` a). Let (x i , y i ) (i = 0, 1, 2, ..., m) be any set of points satisfiying the conditions

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The Space of Bounded p(·) Variation in Wiener’s Sense with Variable Exponent

The Space of Bounded p(·) Variation in Wiener’s Sense with Variable Exponent

In recent years, there has been an increasing interest in the study of various mathematical problems with variable exponents. With the emergency of nonlinear problems in applied sciences, standard Lebesgue and Sobolev spaces demonstrated their limitations in applications. The class of nonlinear problems with exponent growth is a new research field and it reflects a new kind of physical phenomena. In 2000, the field began to expand even further. Motivated by problems in the study of electrorheological fluids, Diening [10] raised the question of when the Hardy-Littlewood maximal operator and other classical operators in harmonic analysis were bounded on the variable Lebesgue spaces. These and related problems are the subject of active research to this day. These problems were interesting in applications (see [11]-[14]) and gave rise to a revival of the interest in Lebesgue and Sobolev spaces with variable exponent, the origins of which could be traced back to the work of Orlicz in the 1930’s [15]. In the 1950’s, this study was carried on by Nakano [16] [17] who made the first systematic study of spaces with variable exponent. Later, Polish and Czechoslovak mathematicians investigated the modular function spaces (see for the example Musielak [18] [19], Kovacik and Rakosnik [20]). We refer to books [14] for the detailed information on the theoretical approach to the Lebesgue and Sobolev spaces with variable exponents. In [21], Castillo, Merentes and Rafeiro studied a new space of functions of generalized bounded variation. There, the authors introduced the notion of bounded variation in the Wiener sense with the exponent p(⋅)-variable.

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Spectral Theory for Generalized Bounded Variation Perturbations of Orthogonal Polynomials and Schrödinger Operators

Spectral Theory for Generalized Bounded Variation Perturbations of Orthogonal Polynomials and Schrödinger Operators

As we have mentioned before, for Schr¨ odinger operators in more than one dimension the question of self-adjointness and boundary conditions is much more subtle. We will focus on the case when V (x) is a function of |x| alone and quote a result from Reed–Simon [50, Appendix to Section X.1, Example 4]. This will be a decomposition theorem which, under certain conditions, reduces spherically symmetric Schr¨ odinger operators to a direct sum of half-line Schr¨ odinger operators.

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Functions of Bounded (p(⋅), 2) Variation in De la Vallée Poussin Wiener’s Sense with Variable Exponent

Functions of Bounded (p(⋅), 2) Variation in De la Vallée Poussin Wiener’s Sense with Variable Exponent

The class of nonlinear problems with exponent growth is a new research field and it reflects a new kind of physical phenomena. In 2000 the field began to expand even further. Motivated by problems in the study of electrorheological fluids, Diening [9] raised the question of when the Hardy-Littlewood maximal operator and other classical operators in harmonic analysis are bounded on variable Lebesgue spaces. These and related problems are the subject of active research to this day. These problems are interesting in applications (see [10] [11] [12] [13]) and gave rise to a revival of the interest in Lebesgue and Sobolev spaces with variable exponent, the origins of which can be traced back to the work of Orlicz [14] in the 1930’s. In the 1950’s, this study was carried on by Nakano [15] [16] who made the first systematic study of spaces with variable exponent. Later, Polish and Czechoslovak mathematicians investigated the modular function spaces (see for example Musielak [17] [18], Kovacik and Rakosnik [19] and Kozlowski [20]). We refer to the book [13] for detailed information on the theoretical approach for the Lebesgue and Sobolev spaces with variable exponents. Recently, in [21] Castillo, Merentes and Rafeiro studied a new space of functions of generalized bounded variation. They introduced the notion of bounded variation in the Wiener sense with variable exponent p ( ) ⋅ on [ ] a b , and study some of its properties.

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Continuous Piecewise Linear Approximation of BV Function

Continuous Piecewise Linear Approximation of BV Function

Kahane (1961) [3] gave a result which was concerned with how to obtain the variable knot of function in bounded variation space. Zhang (2009) [4] gave the corresponding numerical experiments by using the piece- wise constants function. Moreover, the advantages of Zhang’s method over other denoising methods, such as Visushrink [5] and SureShrinkage [6] were also analyzed [4].

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On Bounded Second Variation

On Bounded Second Variation

 a b The class of all functions of bounded variation on ,  is denoted as BV a b   , . The renowned Jordan’s theorem ([1]) states that a function f : ,   a b   is of bounded variation on   a b , if, and only if, it is the diference of two monotone functions. In particular, every function in BV   a b , has left limit f x    at every point x   a b ,  and right limit f x   + at every point

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The expected variation of random bounded integer sequences of finite length

The expected variation of random bounded integer sequences of finite length

its most compelling aspect is its vertical variation, that is, the sum of the vertical distances between its adjacent terms. Denoted by varw, the vertical variation of the sequence in (1.1) is var w = 2 + 1 + 0 + 2 + 1 = 6. Our purpose here is to compute the mean and vari- ance of var on four classical sets of combinatorial sequences.

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Error Estimates for Approximating the Fourier Transform of Functions of Bounded Variation

Error Estimates for Approximating the Fourier Transform of Functions of Bounded Variation

In this paper, by use of some integral identities and inequalities developed in [4](see also [5]), we point out some approximations of the Fourier transform in terms of the complex exponential mean E (z, w) (see Section 2) and study the error of approximation for different classes of mappings of bounded variation defined on finite intervals.

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A bounded model of time variation in trend inflation, NAIRU and the Phillips curve

A bounded model of time variation in trend inflation, NAIRU and the Phillips curve

Stella and Stock (2013) is in its treatment of the latent states. Following most of the existing literature, Stella and Stock (2013) model trend in‡ation and the NAIRU as driftless random walks. Modeling trend in‡ation as a ran- dom walk is a component of many macroeconomic models (e.g., among many others, Smets and Wouters, 2003, Ireland, 2007, Stock and Watson, 2007 and Cogley, Primiceri and Sargent, 2010), despite the fact that there are many reasons for thinking that trend in‡ation should not wander in an unbounded random-walk fashion. For instance, the existence of explicit or implicit in‡a- tion targets by central banks means that trend or underlying in‡ation will be kept within bounds and not allowed to grow in an unbounded fashion. For NAIRU bounding the counterfactual implications of unrestricted movements in the random walk is perhaps more important. With the exception of abrupt changes in employment law or unemployment bene…ts, which are observable events, one would expect the forces determining the NAIRU to be slow mov- ing and not lead to declines of unemployment to levels close to zero or levels above previous peaks in the unemployment rate driven by recessions. This is particularly the case because the unemployment rate by construction is a bounded variable and one would expect long-run equilibrium in the labor market to produce strong restrictions on its movement within this bounded interval. Further, by imposing the unrestricted random walk speci…cation on NAIRU researchers by construction add excess uncertainty to the possible location of NAIRU in the past, present and future. Building on our previ- ous work, Chan, Koop and Potter (2013), we embed this bounded model of NAIRU within a structure where the central bank keeps trend in‡ation well-contained, allowing us to better discriminate between cyclical and trend movements in in‡ation.

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Henstock Kurzweil Integral Transforms

Henstock Kurzweil Integral Transforms

Let f be a function defined on an infinite interval a, ∞, One can suppose that f is defined on a, ∞ assuming that f∞ 0. Thus, f is Henstock-Kurzweil integrable on a, ∞ if f extended on a, ∞ is HK-integrable. For functions defined over intervals −∞, a and −∞, ∞ One can makes similar considerations.

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Bounded sets in the range 
			of an X∗∗ valued measure with 
bounded variation

Bounded sets in the range of an X∗∗ valued measure with bounded variation

Abstract. Let X be a Banach space and A ⊂ X an absolutely convex, closed, and bounded set. We give some sufficient and necessary conditions in order that A lies in the range of a measure valuedin the bidual space X ∗∗ andhaving boundedvariation. Among other results, we prove that X ∗ is a G. T.-space if andonly if A lies inside the range of some X ∗∗ -valuedmeasure with boundedvariation whenever X A is isomorphic to a Hilbert space.

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Integral representation of Skorokhod reflection

Integral representation of Skorokhod reflection

The Skorokhod reflection problem has a long history. Skorokhod [10] introduced it as a method for representing a diffusion process with a reflecting boundary at zero. Given a continuous function X : [0, ∞) → R , the standard Skorokhod reflection problem seeks to find (Q(t), t ≥ 0) and a continuous, nondecreasing function Y : [0, ∞) → R + with Y (0) = 0,

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