References

Quadrilateral HPS

The quadrilateral HPS implementation is a reduced Python version of the MATLAB Surfacefun package:

https://github.com/danfortunato/surfacefun

Fortunato, D. (2024). A high-order fast direct solver for surface PDEs. SIAM Journal on Scientific Computing, 46(4), A2582-A2606.

Triangular HPS

The triangular formulation and fast direct solver framework are introduced in:

A High-Order Fast Direct Solver for Surface PDEs on Triangles

https://arxiv.org/pdf/2604.03097