【摘 要】
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The energy of a simple graph is defined as the sum of the absolute values of all the eigenvalues of the corresponding adjacency matrix.Let be the collection of
【机 构】
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DepartmentofMathematics,QinghaiUniversity,Xining810008
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The energy of a simple graph is defined as the sum of the absolute values of all the eigenvalues of the corresponding adjacency matrix.Let be the collection of trees with vertices.Ou finds the structure of tree which has maximal energy among all trees with center of degree and diameter 4.This paper improves the result.By using quasi-order,Coulson integral formula and related knowledge of differential calculus, the structure of the tree with maximal energy and diameter 4 is completely determined.
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