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We present a boundary integral method for solving a certain class of Riemann-Hilbert problems known as the general conjugation problem. The method is based on a uniquely solvable boundary integral equation with the generalized Neumann…

Complex Variables · Mathematics 2016-10-25 Mohamed M S Nasser

A Fredholm integral equation of the second kind with the generalized Neumann kernel associated with the Riemann-Hilbert problem on unbounded multiply connected regions will be derived and studied in this paper. The derived integral equation…

Complex Variables · Mathematics 2021-07-27 Mohamed M. S. Nasser

This paper presents a new uniquely solvable boundary integral equation for computing the conformal mapping, its derivative and its inverse from bounded multiply connected regions onto the five classical canonical slit regions. The integral…

Complex Variables · Mathematics 2015-06-08 Mohamed M. S. Nasser , Ali H. M. Murid , Ali W. K. Sangawi

A fast method for solving boundary integral equations with the generalized Neumann kernel and the adjoint generalized Neumann kernel is presented. The method is based on discretizing the integral equations by the Nystr\"om method with the…

Numerical Analysis · Mathematics 2015-04-10 Mohamed M. S. Nasser

The relation between the Ahlfors map and Szeg\"o kernel S(z, a) is classical. The Szeg\"o kernel is a solution of a Fredholm integral equation of the second kind with the Kerzman-Stein kernel. The exact zeros of the Ahlfors map are unknown…

Complex Variables · Mathematics 2014-12-19 Ali W. K. Sangawi , Kashif Nazar , Ali H. M. Murid

We present a numerical method for the computation of the conformal map from unbounded multiply-connected domains onto lemniscatic domains. For $\ell$-times connected domains the method requires solving $\ell$ boundary integral equations…

Complex Variables · Mathematics 2019-08-26 Mohamed M. S. Nasser , Jörg Liesen , Olivier Sète

We prove the existence of global renormalized solutions to the Boltzmann equation in bounded domain with incoming boundary condition, with non-cutoff collision kernels. Thus we extend the results of \cite{villani2002noncutoff} for whole…

Analysis of PDEs · Mathematics 2017-03-20 Ning Jiang , Xu Zhang

The authors propose a Nystrom method to approximate the solution of a boundary integral equation connected with the exterior Neumann problem for Laplace's equation on planar domains with corners. They prove the convergence and the stability…

Numerical Analysis · Mathematics 2015-04-15 Luisa Fermo , Concetta Laurita

A large class of initial-boundary value problems of linear evolution partial differential equations formulated on the half-line is analyzed via the unified transform method. In particular, explicit formulae are presented for the generalized…

Analysis of PDEs · Mathematics 2016-04-21 Athanassios S. Fokas , Zipeng Wang

The first result of the present paper is to provide classes of explicit solutions for integrable boundary matrices for the multi-species ASEP with an arbitrary number of species. All the solutions we have obtained can be seen as…

Mathematical Physics · Physics 2017-05-03 N. Crampe , C. Finn , E. Ragoucy , M. Vanicat

This paper establishes tahe existence and uniqueness of the nonlinear Knudsen layer equation with incoming boundary conditions. It is well-known that the solvability conditions of the problem vary with the Mach number of the far Maxwellian…

Analysis of PDEs · Mathematics 2025-01-09 Ning Jiang , Yi-Long Luo , Yulong Wu , Tong Yang

In this paper, we study the computational question of whether the Steklov spectrum of smooth simply connected planar domains can be approximated accurately by a boundary-only formulation based on harmonic conjugation. For the unit disk, the…

Numerical Analysis · Mathematics 2026-04-08 Jamie Swan , Mohamed M. S. Nasser , Harri Hakula , Matti Vuorinen

We show how to express a conformal map of a general two connected domain in the plane such that neither boundary component is a point to a representative domain which has the virtue of having an explicit algebraic Bergman kernel function.…

Complex Variables · Mathematics 2008-01-16 Steven R. Bell , Ersin Deger , Thomas Tegtmeyer

We prove that the Bergman kernel function associated to a finitely connected domain in the plane is given as a rational combination of only three basic functions of one complex variable: an Alhfors map, its derivative, and one other…

Complex Variables · Mathematics 2007-05-23 Steven R. Bell

A path integral is presented that solves a general class of linear second order partial differential equations with Dirichlet/Neumann boundary conditions. Elementary kernels are constructed for both Dirichlet and Neumann boundary…

Mathematical Physics · Physics 2012-12-04 J. LaChapelle

In this paper, we analyze nonlinear differential equations subject to generalized boundary conditions. More specifically, we provide a framework from which we can provide conditions, which are straightforward to check, for the solvability…

Analysis of PDEs · Mathematics 2019-03-05 Benjamin Freedman , Jesús Rodríguez

In this paper, we reduce the general linear integral equation of the third kind in $L^2(Y,\mu)$, with largely arbitrary kernel and coefficient, to an equivalent integral equation either of the second kind or of the first kind in…

Spectral Theory · Mathematics 2012-10-04 Igor M. Novitskii

We present an algorithm for characterising the generalised Dirichlet to Neumann map for moving initial-boundary value problems. This algorithm is derived by combining the so-called global relation, which couples the initial and boundary…

Mathematical Physics · Physics 2009-11-11 A. S. Fokas , B. Pelloni

The nonlocal diffusion equation with continuous kernel $K(x,y$, with $ \int_{R} K(y,x) \, d \, y = 1$ has been proposed as a model for some evolution process with diffusion, including population models. However, in general, we don't have $…

Classical Analysis and ODEs · Mathematics 2025-09-22 Antonio Luiz Pereira

This paper generalizes the bordered-algebraic knot invariant introduced in an earlier paper, giving an invariant now with more algebraic structure. It also introduces signs to define these invariants with integral coefficients. We describe…

Geometric Topology · Mathematics 2019-02-14 Peter S. Ozsvath , Zoltan Szabo
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