Cross Reference
Vertex:
"Euler showed that there were lines-- any kind of lines, crooked or not socrooked. He then showed that the pattern of two or more lines crossing one another was completely distinguishable from any single line by itself. We call this crossing, or convergence of lines a Vertex.
“When three or more lines each cross two others, we have enclosures or areas. So Euler had areas, vertexes, and lines which he said were fundamentally unmistakable for one another. Euler showed also that all conceptual experiences which we can pattern, or form, are composed exclusively of three patterning elements: lines, vertexes and areas. They are all that are necessary to analyze and inventory all parts of, as well as all whole, patterns.”
-Cite Carbondale-DRAPT IV-41
