# Definition: Laplacian Matrix for triangle meshes

Quick definition of the Laplacian matrix on a triangular mesh. I give an in depth explanation here.

# Normal to an implicit surface

Just leaving some notes to differentiate expressions with the $$\nabla$$ operator to compute gradients of various functions.
To represent a 2D function $$z = f(x,y)$$ one can draw a 3D surface. The higher the $$z$$ value the higher the point on the surface (see above).