Document classification, indexing and abstracting may be inherently difficult problems

  • Authors:

  • Aviezri S. Fraenkel

  • Affiliations:

  • The Weizmann Institute of Science, Rehovot, Israel

  • Venue:
  • SIGIR '81 Proceedings of the 4th annual international ACM SIGIR conference on Information storage and retrieval: theoretical issues in information retrieval
  • Year:
  • 1981

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Abstract

The main features of document indexing are abstracted. It is shown that the easy part of indexing, namely the question whether there is a bounded number of descriptors for indexing a document is NP-complete. Thus even the most efficient algorithm for exact indexing is not, at least at the present time, bounded by a polynomial-time function.