The unified method: I. Nonlinearizable problems on the half-line

AS Fokas, J Lenells - Journal of Physics A: Mathematical and …, 2012 - iopscience.iop.org
Boundary value problems for integrable nonlinear evolution PDEs formulated on the half-
line can be analyzed by the unified method introduced by one of the authors and used …

Boundary behavior of the solution to the linear Korteweg‐De Vries equation on the half line

A Chatziafratis, S Kamvissis… - Studies in Applied …, 2023 - Wiley Online Library
In this paper, we consider the solution to the linear Korteweg‐De Vries (KdV) equation, both
homogeneous and forced, on the quadrant x∈ R+, t∈ R+ {x∈R^+,t∈R^+} via the unified …

Advances in the study of boundary value problems for nonlinear integrable PDEs

B Pelloni - Nonlinearity, 2015 - iopscience.iop.org
In this review I summarize some of the most significant advances of the last decade in the
analysis and solution of boundary value problems for integrable partial differential equations …

Synthesis, as opposed to separation, of variables

AS Fokas, EA Spence - Siam Review, 2012 - SIAM
Every applied mathematician has used separation of variables. For a given boundary value
problem (BVP) in two dimensions, the starting point of this powerful method is the separation …

Extensions of the d'Alembert formulae to the half line and the finite interval obtained via the unified transform

AS Fokas, K Kalimeris - IMA Journal of Applied Mathematics, 2022 - academic.oup.com
We derive the solution of the one-dimensional wave equation for the Dirichlet and Robin
initial-boundary value problems (IBVPs) formulated on the half line and the finite interval …

A hybrid analytical-numerical technique for elliptic PDEs

MJ Colbrook, TS Fokas, P Hashemzadeh - SIAM Journal on Scientific …, 2019 - SIAM
Recent work has given rise to a novel and simple numerical technique for solving elliptic
boundary value problems formulated in convex polygons in two dimensions. The method …

[PDF][PDF] Long-Range Instability of Linear Evolution PDE on Semi-Bounded Domains via the Fokas Method

A Chatziafratis, L Grafakos, S Kamvissis - Dynamics of PDE, 2024 - users.math.uoc.gr
We study the inhomogeneous Airy partial differential equation (also called Stokes or
linearized Korteweg-de Vries equation with a negative sign) on the half-line with generic …

A transform method for Laplace's equation in multiply connected circular domains

D Crowdy - IMA Journal of Applied Mathematics, 2015 - academic.oup.com
A new general transform method for the solution of mixed boundary value problems (BVPs)
for Laplace's equation in multiply connected circular domains is formulated. Circular …

The Dirichlet-to-Neumann map for the elliptic sine-Gordon equation

AS Fokas, B Pelloni - Nonlinearity, 2012 - iopscience.iop.org
We analyse the Dirichlet problem for the elliptic sine-Gordon equation in the upper half
plane. We express the solution q (x, y) in terms of a Riemann–Hilbert problem whose jump …

Extending the unified transform: curvilinear polygons and variable coefficient PDEs

MJ Colbrook - IMA Journal of Numerical Analysis, 2020 - academic.oup.com
We provide the first significant extension of the unified transform (also known as the Fokas
method) applied to elliptic boundary value problems, namely, we extend the method to …