Eccentricity of a vertex
Eccentricity of a vertex --- эксцентриситет вершины.
Let be the distance in a graph . Then the eccentricity of a vertex is the maximum over . The minimum over the eccentricities of all vertices of is the radius of , whereas the maximum is the diameter of . A pair of vertices of is called diametral iff . A chain in which length is equal to is called a diametral chain.