Quotes About Vertices

Definition 20. If some new vertices of degree 2 are added to some of the edges of a graph G, the resulting graph H is called an expansion of G.

There are lines of geomagnetic force running through the Earth's crust, and most of the time, these run in opposing directions - forward and backward. In some places, they deviate and will cross each other, and when that happens, you kind of get a geomagnetic mess going in all different directions. I call these vertices.