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upper and lower bounds for the first and second zagreb indices of quasi bicyclic graphs
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نویسنده
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aghel majid ,erfanian ahmad ,dehghan-zadeh tayebeh
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منبع
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iranian journal of mathematical chemistry - 2021 - دوره : 12 - شماره : 2 - صفحه:79 -88
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چکیده
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The aim of this paper is to give an upper and lower bounds for the first and second zagreb indices of quasi bicyclic graphs. for a simple graph g, we denote m1(g) and m2(g), as the sum of deg2(u) overall vertices u in g and the sum of deg(u)deg(v) of all edges uv of g, respectively. the graph g is called quasi bicyclic graph if there exists a vertex x ∈ v (g) such that g−x is a connected bicyclic graph. the results mentioned in this paper, are mostly new or an improvement of results given by authors for quasi unicyclic graphs in [1].
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کلیدواژه
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first zagreb index ,second zagreb index ,quasi bicyclic graphs
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آدرس
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ferdowsi university of mashhad, center of excellence in analysis on algebraic structures, department of pure mathematics, iran, ferdowsi university of mashhad, center of excellence in analysis on algebraic structures, department of pure mathematics, iran, university of kashan, faculty of mathematical sciences, department of pure mathematics, iran
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پست الکترونیکی
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ta.dehghanzadeh@gmail.com
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Authors
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