نوع مقاله : مقاله پژوهشی
نویسندگان
گروه ریاضی کاربردی دانشکده علوم ریاضی دانشگاه فردوسی مشهد
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Let G be a graph and d_G(v) be the degree of v in G. Then, the sum of the k-power degrees of G is defined as \Sigma_k(G) = \sum_{u \in V(G)}d_G(u)^k. In this paper, we obtain a relationship between Stirling number, number of trees of subsets and the sum of the k-power degrees of the chemical graphs. Also, we characterize the extremal unicyclic graphs based on the sum of the k-power degrees of the graphs.
کلیدواژهها [English]