Abstract
With the development of system complexity, a variety of nondeterministic information is frequently encountered in networks. To deal with the nondeterministic information, uncertainty theory is proposed as a powerful tool. Within the framework of uncertainty theory, in this paper, a concept of tree index of uncertain graph is proposed. It also gives a method to calculate tree index of uncertain graphs. Moreover, the tree index of uncertain cycle and the path index of uncertain graphs are proposed and analyzed in a similar way.
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