New Bounds for Zagreb Eccentricity Indices

• 作者: Nilanjan De
• 来源期刊: 离散数学期刊(英文)
• 学科: 数学
• 关键词: VERTEX DEGREE ECCENTRICITY Zagreb ECCENTRICITY Indices
• 年，卷（期）: 2013,（1）
• 页码范围: 70-74
• 页数: 5页
• 分类号: O1

摘要

The Zagrebeccentricity indices are the eccentricity version of the classical Zagrebindices. The first Zagrebeccentricity index (E1(G)) is defined as sum of squares of the eccentricities of the vertices and the second Zagrebeccentricity index (E2(G)) is equal to sum of product of the eccentricities of the adjacent vertices. In this paper we give some new upper and lower bounds for first and second Zagreb eccentricity indices.