|
Figure 8
v is a vertex of a triangle (shown in black) of level k. At v there is a small hexagon and its stripe allows for only two things to happen: either one of the edges of the triangle extends through v, in which case it is an edge from a larger triangle, or there is an edge passing through v that is parallel to the opposite edge of the triangle. In the latter case we use (i) of proposition 4.1 ![]() |