Quermaβintegrale zentralsymmetrischer Deckel

We give lower bounds for the volume, the surface area, and the other quermass-integrals of centro-symmetric convex universal covers in n-dimensional Euclidean spaces. The estimates are sharp in the case n = 2. The given bounds are also bounds for the quermassintegrals of convex translation covers.     

Error bounds for set inclusions

A variant of Robinson-Ursescu Theorem is given in normed spaces. Several error bound theorems for convex inclusions are proved and in particular a positive answer to Li and Singer's conjecture is given under weaker assumption than the assumption required in their conjecture. Perturbation error bounds are also studied. As applications, we study error bounds for convex inequality systems.     

Exponential inequalities for sums of random vectors

This paper presents some generalizations of S. N. Bernstein's exponential bounds on probabilities of large deviations to the vector case. Inequalities for probabilities of large deviations of sums of independent random vectors are derived under a Cramér's type restriction on the rate of growth of absolute moments of the summands. Estimates are obtained for random vectors with values in Banach space, Sharper bounds hold in the case of finite-dimensional Euclidean or separable Hilbert spaces.     

On lower bounds on the size of designs in compact symmetric spaces of rank 1

The concept of t-designs in compact symmetric spaces of rank 1 is a generalization of the theory of classical t-designs. In this paper we obtain new lower bounds on the cardinality of designs in projective compact symmetric spaces of rank 1. With one exception our bounds are the first improvements of the classical bounds by more than one. We use the linear programming technique and follow the approach we have proposed for spherical codes and designs. Some examples are shown and compared with the classical bounds.     

On Construction of Optimal A2-Codes

§ 1.Ｉｎｔｒｏｄｕｃｔｉｏｎ　Ｔｈｅａｕｔｈｅｎｔｉｃａｔｉｏｎｃｏｄｅｓｗｉｔｈａｒｂｉｔｒａｔｉｏｎ (Ａ2 ｃｏｄｅｓ)ａｒｅｉｎｔｒｏｄｕｃｅｄｂｙＳｉｍｍｏｎｓ[1]ａｎｄｓｔｕｄｉｅｄｉｎｍａｎｙｐａｐｅｒｓ (ｆｏｒｅｘａｍｐｌｅ ,[1— 8] ) .Ｏｎｅｏｆｔｈｅｍｏｓｔｉｍｐｏｒｔａｎｔｐｒｏｂｌｅｍｓｉｎｔｈｅｓｔｕｄｙｏｆａｕｔｈｅｎｔｉｃａｔｉｏｎｃｏｄｅｓｉｓｔｏｆｉｎｄｌｏｗｅｒｂｏｕｎｄｓｏｎｃｈｅａｔｉｎｇｐｒｏｂａｂｉｌｉｔｉｅｓａｎｄｏｎｔｈｅｎｕｍｂｅｒｓｏｆｅｎｃｏｄｉ…     

Bounds on Projections onto Bivariate Polynomial Spline Spaces with Stable Local Bases

L _& ∞ bounds for norms of projections onto bivariate polynomial spline spaces on regular triangulations with stable local bases are established. The general results are then applied to obtain error bounds for best L ₂ - and l ₂ -approximation by splines on quasi-uniform triangulations. March 8, 2000. Date revised: November 20, 2000. Date accepted: July 9, 2001.     

On Seshadri Constants of Canonical Bundles of Compact Complex Hyperbolic Spaces

Upper and lower bounds for the Seshadri constants of canonical bundles of compact hyperbolic spaces are given in terms of metric invariants. The lower bound is obtained by carrying out the symplectic blow-up construction for the Poincaré metric, and the upper bound is obtained by a convexity-type argument.     

Global Error Bounds for <Emphasis Type="Italic">γ</Emphasis>-paraconvex Multifunctions

In this paper, error bounds for γ-paraconvex multifunctions are considered. A Robinson-Ursescu type Theorem is given in normed spaces. Some results on the existence of global error bounds are presented. Perturbation error bounds are also studied.     

Recurrence Relations for Chebyshev-Type Methods

The convergence of new second-order iterative methods are analyzed in Banach spaces by introducing a system of recurrence relations. A system of a priori error bounds for that method is also provided. The methods are defined by using a constant bilinear operator A , instead of the second Fréchet derivative appearing in the defining formula of the Chebyshev method. Numerical evidence that the methods introduced here accelerate the classical Newton iteration for a suitable A is provided. Accepted 23 October 1998     

若干周期再生核空间的覆盖数

借助离散Fourier变换给出估计Mercer核矩阵逆矩阵范数上界的一种方法,由此给出了估计周期再生核Hilbert空间覆盖数的上、下界的一般方法.特别, 对两种特殊的周期再生核空间覆盖数的上、下界进行了比较.     

Extrinsic curvature of semiconvex subspaces in Alexandrov geometry

In Alexandrov spaces of curvature bounded either above (CBA) or below (CBB), we obtain extrinsic curvature bounds on subspaces associated with semiconcave functions. These subspaces play the role in singular geometry of submanifolds in Riemannian geometry, and arise naturally in many different places. For CBA spaces, we obtain new intrinsic curvature bounds on subspaces. For CBB spaces whose boundary is extrinsically curved, we strengthen Perelman’s concavity theorem for distance from the boundary, deriving corollaries on sharp diameter bounds, contractibility, and rigidity.     

Some inequalities for the Euclidean operator radius of two operators in Hilbert spaces

Some sharp bounds for the Euclidean operator radius of two bounded linear operators in Hilbert spaces are given. Their connection with Kittaneh’s recent results which provide sharp upper and lower bounds for the numerical radius of linear operators are also established.     

Some logical metatheorems with applications in functional analysis

In previous papers we have developed proof-theoretic techniques for extracting effective uniform bounds from large classes of ineffective existence proofs in functional analysis. Here `uniform' means independence from parameters in compact spaces. A recent case study in fixed point theory systematically yielded uniformity even w.r.t. parameters in metrically bounded (but noncompact) subsets which had been known before only in special cases. In the present paper we prove general logical metatheorems which cover these applications to fixed point theory as special cases but are not restricted to this area at all. Our theorems guarantee under general logical conditions such strong uniform versions of non-uniform existence statements. Moreover, they provide algorithms for actually extracting effective uniform bounds and transforming the original proof into one for the stronger uniformity result. Our metatheorems deal with general classes of spaces like metric spaces, hyperbolic spaces, CAT(0)-spaces, normed linear spaces, uniformly convex spaces, as well as inner product spaces.

     

An interpolation theorem related to the a.e. convergence of integral operators

We show that for integral operators of general form the norm bounds in Lorentz spaces imply certain norm bounds for the maximal function. As a consequence, the a.e. convergence for the integral operators on Lorentz spaces follows from the appropriate norm estimates.

     

Transience and capacity of minimal submanifolds

We prove explicit lower bounds for the capacity of annular domains of minimal submanifolds P ^m in ambient Riemannian spaces N ⁿ with sectional curvatures bounded from above. We characterize the situations in which the lower bounds for the capacity are actually attained. Furthermore we apply these bounds to prove that Brownian motion defined on a complete minimal submanifold is transient when the ambient space is a negatively curved Hadamard-Cartan manifold. The proof stems directly from the capacity bounds and also covers the case of minimal submanifolds of dimension m > 2 in Euclidean spaces.     

框架的局部化

Grochenig and Balan, Casazza, Heil, and Landau introduced the concepts of localization. The concepts were used to Gabor frames, wavelet frames and sampling theorem in recent years. Here they are applied to the frame of exponential windows with the conclusion that the frame of exponential windows is a Banach frame for a kind of Banach spaces, and the conclusion is also obtained about the relationship between frame bounds, frame density, measure and density of indexing set.     

Sufcient Conditions for Error Bounds and Linear Regularity in Banach Spaces

In this paper,we study error bounds for lower semicontinuous functions defned on Banach space and linear regularity for fnitely many closed subset in Banach spaces.By using Clarke's subdiferentials and Ekeland variational principle,we establish several sufcient conditions ensuring error bounds and linear regularity in Banach spaces.     

A Sobolev Poincaré type inequality for integral varifolds

In this work a local inequality is provided which bounds the distance of an integral varifold from a multivalued plane (height) by its tilt and mean curvature. The bounds obtained for the exponents of the Lebesgue spaces involved are shown to be sharp.     

Sufficient conditions for error bounds and linear regularity in Banach spaces

In this paper, we study error bounds for lower semicontinuous functions defined on Banach space and linear regularity for finitely many closed subset in Banach spaces. By using Clarke＇s subd- ifferentials and Ekeland variational principle, we establish several sufficient conditions ensuring error bounds and linear regularity in Banach spaces.     

拓扑空间中新的广义L-KKM型定理及其应用

In this paper, some new generalized L-KKM type theorems with finitely open values and with finitely closed values are established without any convexity structure in topological spaces. As applications, some new matching theorem, fixed point theorem and existence the orem of equilibrium problem with lower and upper bounds are also given under some suitable conditions. These theorems presented in this paper unify and generalize some corresponding known results in recent literatures.