A Note on Local Ultrametricity in Text

Details A Note on Local Ultrametricity in Text A Note on Local Ultrametricity in Text

2007-01-27

arxiv.org/abs/cs/0701181v1

Computer Science

Computation and Language

18 pp

Scientific paper

High dimensional, sparsely populated data spaces have been characterized in terms of ultrametric topology. This implies that there are natural, not necessarily unique, tree or hierarchy structures defined by the ultrametric topology. In this note we study the extent of local ultrametric topology in texts, with the aim of finding unique ``fingerprints'' for a text or corpus, discriminating between texts from different domains, and opening up the possibility of exploiting hierarchical structures in the data. We use coherent and meaningful collections of over 1000 texts, comprising over 1.3 million words.

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