Quasi-Optimal Elimination Trees for 2D Grids with Singularities

Table 3

Refinement levels for particular elements from mesh with edge singularity.

Refinement level	Area	Elements
1	1	2, 3
2	1/4	6, 7, 10, 11
3	1/16	13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28