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the f–index for some special graphs and some properties of the f–index
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نویسنده
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yousefi asghar ,iranmanesh ali ,dobrynin andrey a. ,tehranian abolfazl
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منبع
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iranian journal of mathematical chemistry - 2018 - دوره : 9 - شماره : 3 - صفحه:213 -225
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چکیده
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The forgotten topological index or f–index has been introduced by furtula and gutman in 2015. the f–index of a (molecular) graph is defined as the sum of cubes of the vertex degrees of the graph. in this paper, we compute this topological index for some special graphs such as wheel graph, barbell graph and friendship graph. moreover, the effects on the f–index are observed when some operations such as edge switching, edge moving and edge separating are applied to the graphs. finally, we investigate degeneracy of f–index for small graphs.
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کلیدواژه
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forgotten topological index ,edge switching ,edge moving ,edge separating ,k–apex tree
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آدرس
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islamic azad university, science and research branch, department of mathematics, ایران, tarbiat modares university, department of mathematics, i r iran, siberian branch of the russian academy of sciencessciences, sobolev institute of mathematics, russia, islamic azad university, science and research branch, department of mathematics, ایران
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پست الکترونیکی
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tehranian@srbiau.ac.ir
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Authors
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