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Clifford algebra valued orthogonal polynomials in the open unit ball of Euclidean space

Clifford algebra valued orthogonal polynomials in the open unit ball of Euclidean space

A new method for constructing Clifford algebra-valued orthogonal polynomials in the open unit ball of Euclidean space is presented. In earlier research, we only dealt with scalar-valued weight functions. Now the class of weight functions involved is enlarged to encompass Clif- ford algebra-valued functions. The method consists in transforming the orthogonality re- lation on the open unit ball into an orthogonality relation on the real axis by means of the so-called Clifford-Heaviside functions. Consequently, appropriate orthogonal polynomi- als on the real axis give rise to Clifford algebra-valued orthogonal polynomials in the unit ball. Three specific examples of such orthogonal polynomials in the unit ball are discussed, namely, the generalized Clifford-Jacobi polynomials, the generalized Clifford-Gegenbauer polynomials, and the shifted Clifford-Jacobi polynomials.

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Properties of Weighted Composition Operators on Some Weighted Holomorphic Function Classes in the Unit Ball

Properties of Weighted Composition Operators on Some Weighted Holomorphic Function Classes in the Unit Ball

Through this paper, B is the unit ball of the n-dimensional complex Euclidean space C n , S is the boundary of B . We denote the class of all holomorphic functions, with the compact-open topology on the unit ball B by H( B ). For any z = (z 1 , z 2 , . . . , z n ), w = (w 1 , w 2 , . . . , w n ) ∈ C n , the inner product is defined by hz, wi = z 1 w 1 + . . . + z n w n , and write |z| =

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Construction of Polynomial Solutions to the Dirichlet Boundary Value Problem for the 3-Harmonic Equation in the Unit Ball

Construction of Polynomial Solutions to the Dirichlet Boundary Value Problem for the 3-Harmonic Equation in the Unit Ball

∆ = , where Q x ( ) is an arbitrary polynomial are constructed. On this base in [9] polynomial solution of the Dirichlet boundary value problem and a generalized third boundary value problem for the Poisson's equation are constructed. In [10] the Dirichlet boundary value problem for the biharmonic equation in the unit ball Ω is considered. In [16] solvability conditions of the Neumann boundary value problem for the biharmonic equation in the unit ball are given and its polynomial solution is constructed. The present paper is a continuation of those investigations for the 3 -harmonic equation ∆ 3 u x ( ) = Q x ( ) in the unit ball Ω . It hopefully allows to solve the Dirichlet problem for the polyharmonic equation in Ω . It is necessary to mention the papers [12-13] devoted to this research area.

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Spectrum of Compact Weighted Composition Operators on the Weighted Hardy Space in the Unit Ball

Spectrum of Compact Weighted Composition Operators on the Weighted Hardy Space in the Unit Ball

If ϕ has a fixed point inside the ball, Theorem 2.5 gives the spectrum. Therefore, we compute the spectrum when ϕ has no fixed point inside the unit ball. We will denote the composition of ϕ with itself n times by ϕ n , that is, ϕ n = ϕ ◦ ϕ ◦ ··· ◦ ϕ (n times). Now, we give the last theorem of this paper.

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Weighted Composition Operators between Mixed Norm Spaces and Spaces in the Unit Ball

Weighted Composition Operators between Mixed Norm Spaces and Spaces in the Unit Ball

(4.4) when r < | z | < 1 and | ϕ(z) | ≤ δ. From (3.1), (4.3), and (4.4), the result follows. Theorem 4.2. Suppose that ϕ is an analytic self-map of the unit ball, u ∈ H(B), 0 < p, q < ∞ , φ is normal on [0, 1), and uC ϕ : H(p,q,φ) → H α ∞ is bounded. Then uC ϕ : H(p,q,φ) → H α,0 ∞

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Strongly exposed points in the unit ball of trace class operators

Strongly exposed points in the unit ball of trace class operators

[3] I. C. Gohberg and M. G. Kre˘ın, Introduction to the Theory of Linear Nonselfadjoint Oper- ators, translated from the Russian by A. Feinstein. Translations of Mathematical Monographs, vol. 18, American Mathematical Society, Rhode Island, 1969. [4] R. Grza´ slewicz, Exposed points of the unit ball of ᏸ(H), Math. Z. 193 (1986), no. 4, 595–596. [5] J. R. Holub, On the metric geometry of ideals of operators on Hilbert space, Math. Ann. 201

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Integral Type Operators from  Spaces to Zygmund Type Spaces on the Unit Ball

Integral Type Operators from Spaces to Zygmund Type Spaces on the Unit Ball

The space Fp, q, s, introduced by Zhao in 1, is known as the general family of function spaces. For appropriate parameter values p,q, and s, Fp, q, s coincides with several classical function spaces. For instance, let D be the unit disk in C, Fp, q, s B q2/p if 1 < s < ∞ see 2, where B α , 0 < α < ∞, consists of those analytic functions f in D for

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On some Banach space constants arising in nonlinear fixed point and eigenvalue theory

On some Banach space constants arising in nonlinear fixed point and eigenvalue theory

As is well known, in any infinite-dimensional Banach space one may find fixed point free self-maps of the unit ball, retractions of the unit ball onto its boundary, contractions of the unit sphere, and nonzero maps without positive eigenvalues and normalized eigen- vectors. In this paper, we give upper and lower estimates, or even explicit formulas, for the minimal Lipschitz constant and measure of noncompactness of such maps.

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Kernel convergence and biholomorphic mappings in several complex variables

Kernel convergence and biholomorphic mappings in several complex variables

In the next section, we will prove that there is an equivalence between the kernel convergence and the convergence on compact sets of biholomorphic mappings on the unit ball B which satisfy the growth result (1.1). In the last section, we will obtain some consequences of this result in the case of the ker- nel convergence and the convergence on compact sets of normalized starlike and normalized convex mappings on B. Also, we will prove that there is an equivalence between the notions of a Loewner chain, which satisfies a certain normality condition, and kernel convergence.

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Survey of last ten years of work done in India in some selected areas of functional analysis and

Survey of last ten years of work done in India in some selected areas of functional analysis and

Several important non-linear optimization problems were investigated with very successful out- come by studying properties of subspaces whose unit ball is a proximinal or densely ball remotal set [16-18]. It turns out that Banach spaces whose dual is isometric to L 1 (µ) for some positive measure µ is a rich domain to solve various deep questions arising here. In such spaces any M -deal is ball proximinal and they are also densely ball remotal in several natural situations. These questions are more amenable when the subspace under consideration is of finite codimension. A deep analysis in terms of norm attaining functionals led to the result that if the bi-annihilator of a subspace of finite codimension is strongly ball proximinal only at the points of the given space, then it is strongly ball proximinal [66].

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Methyl­phospho­nic acid, CH3PO(OH)2

Methyl­phospho­nic acid, CH3PO(OH)2

The asymmetric unit of the title compound consists of two crystallographic independent molecules (Fig. 1) with nearly identical geometrical parameters (Tab. 1). These values correspond very well with those of phenyl phosphonic acid that was determined by Mahmoudkhani et al. (2002) at T = 183 (2) K [d(P—O) = 1.536 (2) Å, 1.555 (2) Å; d(P=O) = 1.506 (2) Å and d(P—C) = 1.782 (3) Å] and Weakley (1976) at ambient temperature [d(P—O) = 1.539 (3) Å, 1.550 (4) Å; d(P=O) = 1.496 (4) Å and d(P—C) = 1.773 (5) Å]. With respect to bond angles at phosphorous, tetrahedral

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Unique determination of “subatomic” contrast by imaging covalent backbonding

Unique determination of “subatomic” contrast by imaging covalent backbonding

In this paper, we unambiguously show that “sub-atomic like” features can arise from the back bonding configuration of a surface atom being imaged during DFM. This is done by utilising the change in bonding configuration of the surface adatoms of the Si(111) unit cell between the faulted and unfaulted half. Due to this change in symmetry across the unit cell, the features we observe cannot be assigned to any tip, or feedback artefacts. At the same time, they suggest caution should be used when interpreting “sub-atomic like” features, as our data cannot be interpreted as arising from within a single atom.

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Movement and skill adaptability: A novel approach to talent identification and development in tennis

Movement and skill adaptability: A novel approach to talent identification and development in tennis

The use of a generic movement or skill test for the purpose of identifying talent is becoming more prevalent in the literature, due to minimising the effect of sport-specific training on results (Faber et al., 2014; Vaeyens et al., 2008). Furthermore, motor skills are relatively stable beyond the age of 6 (Vandorpe, Vandendriessche, Vaeyens, Pion, Matthys, et al., 2012). In gymnastics, the KTK was a better predictor of future performance than sprint, agility and even coach’s ranking (Vandorpe, Vandendriessche, Vaeyens, Pion, Lefevre, et al., 2012). The KTK is a test of locomotive stability (Cools et al., 2008) and therefore clearly has some relevance to gymnastics whilst not being sport specific. A study examining a similar theory has been conducted in the field of table tennis (Faber et al., 2014). In this study participants (aged 7-12 years) were required to throw a ball against a wall with one hand and catch with the opposite hand as many times as possible in 30 seconds. The task was designed to be similar to table tennis but not practiced in training. This test was able to discriminate between local, regional and national players. The TRT and CRT operate in a similar vein, in that, the skills and movement pattern required for success maintain a relationship to tennis whilst not being sport specific.

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A gap theorem for free boundary minimal surfaces in the three ball

A gap theorem for free boundary minimal surfaces in the three ball

curve and having the same unit normal vector fields along that curve must be the same (see, for example, [5], Chapter 3, Section 4). On the final steps of our proof, we have shown that, possibly after a rotation, the free boundary minimal surface Σ contains the great circle C = {(x, y, 0); x 2 + y 2 = R} and its normal unit vector field along C is

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On the error in phase transition computations for compressed sensing

On the error in phase transition computations for compressed sensing

wavelet. These operators are constructed using the procedure proposed in Items 1, 2, and 3 in Section VI, respectively. For the wavelet case, we construct a 3072 ˆ 1024 Daubechies wavelet transform where we only retain its high-pass coefficients (of size 2048 ˆ 1). The number of decomposition levels in the wavelet transformation is two. Except for Random 1*, we construct cosparse signals according to the procedure explained in Section VI. For Random 1* we use x “ P nullpΩ S q c, where c is uniformly distributed on the unit sphere S n´1 . In this table, Num E denotes the numerator of E p p and is equal to 2 sup sPBfpxq }s} 2 .

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Model of Rotation Accuracy of High Speed Spindles on Ball Bearings

Model of Rotation Accuracy of High Speed Spindles on Ball Bearings

However, when analyzing precision bearings operat- ing in favourable conditions, we can neglect some of these sources and save only the two first ones. Balmont and Zverev consider the theory of bearing having these inperfections in [2]. Some of the results obtained are presented in Table 1, where the spectrum of radial vi- brodisturbances generated by imperfect ball bearing is presented.

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In vitro hydrodynamic properties of the Miethke proGAV hydrocephalus shunt

In vitro hydrodynamic properties of the Miethke proGAV hydrocephalus shunt

The adjustable unit uses a ball-in-cone valve system. The tension of the spring holding the ball in place can be adjusted by turning the rotor (torsion bar) using the exter- nal magnetic adjustment tool, thus changing the operat- ing pressure. The valve has a brake system that holds the rotor in place to prevent unwanted re-adjustment when the shunt is exposed to an external magnetic field. To release the brake, a downward force (800 to 1600 gram- force) is applied to the unit using the adjustment tool (Figure 1). The valve has a diameter of 18 mm. It has a rel- atively large internal volume compared to other models, which is intended to minimize the risk of obstruction. The gravitational unit (shunt assistant) increases the opening pressure of the shunt when the patient is vertical by blocking the inlet flow using a gravity-assisted ball bearing. If the patient is horizontal, the ball no longer blocks the opening and the unit provides substantially less resistance. When in the vertical position, the opening pressure of the ProGAV is the sum of the opening pressure of the adjustable unit and the gravitational unit. The grav- itational unit is available with a graded cross-sectional area of aperture supporting the ball, which is intended to compensate for the 'siphoning' that occurs in CSF-filled tubing of different lengths. The setting of the shunt assist- ant, expressed in cm should be equivalent to the distance between the right atrium of the heart and the outlet of the peritoneal catheter.

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Design & Control of Magnetic Levitation System ED 4810: Review and Stability Test

Design & Control of Magnetic Levitation System ED 4810: Review and Stability Test

Let suppose 𝑑 2 𝑑𝑡 𝑦(𝑡) 2 = 0, and the gravity acting on the steel ball is constant as 𝑀𝑔 without being changed proportion to the weight of the steel ball, thus if the distance spaced from the center of the ball is y* and an electric current required for an equilibrium between the gravity and magnetic force is i*, from the eq. (3), i* should be agreed with

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