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Thesaurus as a complex networkPhysica A: Statistical Mechanics and its Applications In Proceedings of the International Workshop on 'Trends and perspectives in extensive and non-extensive statistical mechanics', in honor of the 60th birthday of Constantino Tsallis, Vol. 344, No. 3-4. (15 December 2004), pp. 530-536.
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AbstractA thesaurus is one, out of many, possible representations of term (or word) connectivity. The terms of a thesaurus are seen as the nodes and their relationship as the links of a directed graph. The directionality of the links retains all the thesaurus information and allows the measurement of several quantities. This has lead to a new term classification according to the characteristics of the nodes, for example, nodes with no links in, no links out, etc. Using an electronic available thesaurus we have obtained the incoming and outgoing link distributions. While the incoming link distribution follows a stretched exponential function, the lower bound for the outgoing link distribution has the same envelope of the scientific paper citation distribution proposed by Tsallis and Albuquerque (Eur. Phys. J. B 13 (2000) 777). However, a better fit is obtained by simpler function which is the solution of Ricatti's differential equation. We conjecture that this differential equation is the continuous limit of a stochastic growth model of the thesaurus network. We also propose a new manner to arrange a thesaurus using the “inversion method”.
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