213 citations · 1.1k across the 67 of their papers we have counts for
3 papers · 2 filters
On the convergence of local expansions of layer potentials
Charles L. Epstein, Leslie Greengard, Andreas Klöckner
In a recently developed quadrature method (quadrature by expansion or QBX), it was demonstrated that weakly singular or singular layer potentials can be evaluated rapidly and accur…
A fast semi-direct least squares algorithm for hierarchically block separable matrices
Kenneth L. Ho, Leslie Greengard
We present a fast algorithm for linear least squares problems governed by hierarchically block separable (HBS) matrices. Such matrices are generally dense but data-sparse and can d…
Quadrature by Expansion: A New Method for the Evaluation of Layer Potentials
Andreas Klöckner, Alexander Barnett, Leslie Greengard +1
Integral equation methods for the solution of partial differential equations, when coupled with suitable fast algorithms, yield geometrically flexible, asymptotically optimal and w…