2D biharmonic stencil a.k.a bilaplacian operator

Draft work in progress

harmonic and biharmonic stencil (local host)

or here

For triangle mesh not sure where to look, perhaps here:

Biharmonic distance (based on cotan weights)

Biharmonic Coordinates

Localized bi-Laplacian Solver on a Triangle Mesh and Its Applications

Todo: 1d stencil (1 -4 6 -4 1) (https://en.wikipedia.org/wiki/Finite_difference_coefficient)

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