diametrally การใช้

It can be obtained by connecting an apex vertex to each of the degree-three vertices of a rhombic dodecahedron, or by merging two diametrally opposed vertices of a four-dimensional hypercube graph.
Yet, if x and y are two points on a circle diametrally opposite to each other, there exist two metric segments connecting them ( the two arcs into which these points split the circle ), and those two arcs are metrically convex, but their intersection is the set \ { x, y \ } which is not metrically convex.
For instance, the graph with two vertices and one edge is bipartite but is not a bipartite double cover, because it has no non-adjacent pairs of vertices to be mapped to each other by such an involution; on the other hand, the graph of the cube is a bipartite double cover, and has an involution that maps each vertex to the diametrally opposite vertex.