Convex and Concave
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Cross Reference
Convex and Concave:
"The outsides of systems are convex and their insides are concave. While convexity diffuses radiation impinging upon it, concavity concentrates radiation impinging upon it, ergo, convexity and concavity are not the same. . .
"For every tetrahedron there is one convex and one concave. Because the tetrahedron is inherently the minimum structural system of universe, it provides the minimum omni-coexisting convexity and concavity condition in univorse. . .
"For every convex spherical polyhedral geodesic system there is a concave spherical polyhedral geodesic system."
Cross-References
Citations
- RBF on Synergetics draft U. Hass, Amherst, 22 July 1971.
