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A Weighted Tauberian Theorem.

Ka-Sing Lau — 1995

The journal of Fourier analysis and applications [[Elektronische Ressource]]

Infinite Dimensional Polytopes.

Ka-Sing Lau — 1973

Mathematica Scandinavica

The Dual Ball of a Lindenstrauss Space.

Ka-Sing Lau — 1973

Mathematica Scandinavica

The class of convolution operators on the Marcinkiewicz spaces

Ka-Sing Lau — 1981

Annales de l'institut Fourier

Let $𝒯_{X}$ denote the operator-norm closure of the class of convolution operators $Φ_{μ} : X \to X$ where $X$ is a suitable function space on $R$ . Let $ℳ_{r}^{p}$ be the closed subspace of regular functions in the Marinkiewicz space $ℳ^{p}$ , $1 \leq p < \infty$ . We show that the space $𝒯_{ℳ_{r}^{p}}$ is isometrically isomorphic to $𝒯_{L^{p}}$ and that strong operator sequential convergence and norm convergence in $𝒯_{ℳ_{r}^{p}}$ coincide. We also obtain some results concerning convolution operators under the Wiener transformation. These are to improve a Tauberian theorem of Wiener on $ℳ^{2}$ .

Corrigendum of Mean Quadratic Variations and Fourier Asymptotics of Self-similar Measures.

Ka-Sing Lau; Jianrong Wang — 1995

Monatshefte für Mathematik

Mean Quadratic Variations and Fourier Asymptotics of Self-similar Measures.

Ka-Sing Lau; Jianrong Wang — 1993

Monatshefte für Mathematik

Asyptotic Behaviour of Multiperiodic Functions G(x) = ... g (x/2...).

Ka-Sing Lau; Ai Hua Fan — 1998

The journal of Fourier analysis and applications [[Elektronische Ressource]]

$L^{q}$ -spectrum of the Bernoulli convolution associated with the golden ratio

Ka-Sing Lau; Sze-Man Ngai — 1998

Studia Mathematica

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.

On two classes of Banach spaces with uniform normal structure

Ji Gao; Ka-Sing Lau — 1991

Studia Mathematica

The convolution equation of Choquet and Deny on semigroups

Ka-Sing Lau; Wei-Bin Zeng — 1990

Studia Mathematica

Iterated function systems with a weak separation condition

Ka-Sing Lau; Xiang-Yang Wang — 2004

Studia Mathematica

Nonoverlapping contractive self-similar iterated function systems (IFS) have been studied in great detail via the open set condition. On the other hand much less is known about IFS with overlaps. To deal with such systems, a weak separation condition (WSC) has been introduced recently [LN1]; it is weaker than the open set condition and it includes many important overlapping cases. This paper has two purposes. First, we consider the class of self-similar measures generated by such IFS; we give a...

Ruelle operator with nonexpansive IFS

Ka-Sing Lau; Yuan-Ling Ye — 2001

Studia Mathematica

The Ruelle operator and the associated Perron-Frobenius property have been extensively studied in dynamical systems. Recently the theory has been adapted to iterated function systems (IFS) $(X, {w_{j}}_{j = 1}^{m}, {p_{j}}_{j = 1}^{m})$ , where the $w_{j}$ ’s are contractive self-maps on a compact subset $X \subseteq ℝ^{d}$ and the $p_{j}$ ’s are positive Dini functions on X [FL]. In this paper we consider Ruelle operators defined by weakly contractive IFS and nonexpansive IFS. It is known that in such cases, positive bounded eigenfunctions may not exist in general. Our theorems...

Vector-valued Choquet-Deny theorem, renewal equation and self-similar measures

Ka-Sing Lau; Jian-Rong Wang; Cho-Ho Chu — 1995

Studia Mathematica

The Choquet-Deny theorem and Deny’s theorem are extended to the vector-valued case. They are applied to give a simple nonprobabilistic proof of the vector-valued renewal theorem, which is used to study the $L^{p}$ -dimension, the $L^{p}$ -density and the Fourier transformation of vector-valued self-similar measures. The results answer some questions raised by Strichartz.

Self-affine measures and vector-valued representations

Qi-Rong Deng; Xing-Gang He; Ka-Sing Lau — 2008

Studia Mathematica

Let A be a d × d integral expanding matrix and let $S_{j} (x) = A^{- 1} (x + d_{j})$ for some $d_{j} \in ℤ^{d}$ , j = 1,...,m. The iterated function system (IFS) ${S_{j}}_{j = 1}^{m}$ generates self-affine measures and scale functions. In general this IFS has overlaps, and it is well known that in many special cases the analysis of such measures or functions is facilitated by expressing them in vector-valued forms with respect to another IFS that satisfies the open set condition. In this paper we prove a general theorem on such representation. The proof is constructive;...