预习检查 Whitney theorem then gives us an alternative method for determining the connectivity of a graph G.Not only is K(G) the minimum number of vertices whose removal from G results in a disconnected or trivial graph but K(G)is the maximum positive integer k for which every two vertices y and vin G are connected by k internally disjoint u-v paths in G.预习检查  Whitney theorem then gives us an alternative method for determining the connectivity of a graph G. Not only is K(G) the minimum number of vertices whose removal from G results in a disconnected or trivial graph but K(G) is the maximum positive integer k for which every two vertices u and v in G are connected by k internally disjoint u - v paths in G