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On boundary behavior of Cauchy integrals

Hiroshige Shiga (2013)

Annales UMCS, Mathematica

In this paper, we shall estimate the growth order of the n-th derivative Cauchy integrals at a point in terms of the distance between the point and the boundary of the domain. By using the estimate, we shall generalize Plemelj-Sokthoski theorem. We also consider the boundary behavior of generalized Cauchy integrals on compact bordered Riemann surfaces.

On the analytic capacity and curvature of some Cantor sets with non-σ-finite length.

Pertti Mattila (1996)

Publicacions Matemàtiques

We show that if a Cantor set E as considered by Garnett in [G2] has positive Hausdorff h-measure for a non-decreasing function h satisfying ∫01 r−3 h(r)2 dr < ∞, then the analytic capacity of E is positive. Our tool will be the Menger three-point curvature and Melnikov’s identity relating it to the Cauchy kernel. We shall also prove some related more general results.

On the Neumann-Poincaré operator

Josef Král, Dagmar Medková (1998)

Czechoslovak Mathematical Journal

Let Γ be a rectifiable Jordan curve in the finite complex plane which is regular in the sense of Ahlfors and David. Denote by L C 2 ( Γ ) the space of all complex-valued functions on Γ which are square integrable w.r. to the arc-length on Γ . Let L 2 ( Γ ) stand for the space of all real-valued functions in L C 2 ( Γ ) and put L 0 2 ( Γ ) = { h L 2 ( Γ ) Γ h ( ζ ) | d ζ | = 0 } . Since the Cauchy singular operator is bounded on L C 2 ( Γ ) , the Neumann-Poincaré operator C 1 Γ sending each h L 2 ( Γ ) into C 1 Γ h ( ζ 0 ) : = ( π i ) - 1 P . V . Γ h ( ζ ) ζ - ζ 0 d ζ , ζ 0 Γ , is bounded on L 2 ( Γ ) . We show that the inclusion C 1 Γ ( L 0 2 ( Γ ) ) L 0 2 ( Γ ) characterizes the circle in the class of all...

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