Noun
non-convexity (uncountable)
Alternative spelling of nonconvexity
Convexity and non-convexity Polygons may be characterized by their convexity or type of non-convexity: * Convex : any line drawn through the polygon (and not tangent to an edge or corner) meets its boundary exactly twice. Source: Internet
The conceptual issues raised by complex polytopes, non-convexity, duality and other phenomena led Grünbaum and others to the more general study of abstract combinatorial properties relating vertices, edges, faces and so on. Source: Internet