In this question I have prepared this Geometry Nodes setup to represent the following function
$$f(x,y) = \frac{1}{2}\,\left( y - x + 1 - \sqrt{\left(y-x+1\right)^2 -4y}\,\right) $$
where $$0<=x<=1$$ $$0<=y<=1$$
But the Delete Geometry node will result in jagged edges. Is there another way to use Geometry Nodes to have smoother edges, perhaps without this Delete Geometry node or maybe by merging vertices?

