Search (3 results, page 1 of 1)

0.015846796 = product of:
  0.063387185 = sum of:
    0.063387185 = product of:
      0.12677437 = sum of:
        0.12677437 = weight(_text_:aspects in 2157) [ClassicSimilarity], result of:
          0.12677437 = score(doc=2157,freq=6.0), product of:
            0.20938325 = queryWeight, product of:
              4.5198684 = idf(docFreq=1308, maxDocs=44218)
              0.046325076 = queryNorm
            0.60546565 = fieldWeight in 2157, product of:
              2.4494898 = tf(freq=6.0), with freq of:
                6.0 = termFreq=6.0
              4.5198684 = idf(docFreq=1308, maxDocs=44218)
              0.0546875 = fieldNorm(doc=2157)
      0.5 = coord(1/2)
  0.25 = coord(1/4)

Abstract

Let (DS, DQ, sim) be a retrieval system consisting of a document space DS, a query space QS, and a function sim, expressing the similarity between a document and a query. Following D.M. Everett and S.C. Cater (1992), we introduce topologies on the document space. These topologies are generated by the similarity function sim and the query space QS. 3 topologies will be studied: the retrieval topology, the similarity topology and the (pseudo-)metric one. It is shown that the retrieval topology is the coarsest of the three, while the (pseudo-)metric is the strongest. These 3 topologies are generally different, reflecting distinct topological aspects of information retrieval. We present necessary and sufficient conditions for these topological aspects to be equal

0.014787261 = product of:
  0.059149045 = sum of:
    0.059149045 = product of:
      0.11829809 = sum of:
        0.11829809 = weight(_text_:aspects in 5125) [ClassicSimilarity], result of:
          0.11829809 = score(doc=5125,freq=4.0), product of:
            0.20938325 = queryWeight, product of:
              4.5198684 = idf(docFreq=1308, maxDocs=44218)
              0.046325076 = queryNorm
            0.56498355 = fieldWeight in 5125, product of:
              2.0 = tf(freq=4.0), with freq of:
                4.0 = termFreq=4.0
              4.5198684 = idf(docFreq=1308, maxDocs=44218)
              0.0625 = fieldNorm(doc=5125)
      0.5 = coord(1/2)
  0.25 = coord(1/4)

Abstract

Focuses on possible mathematical theories of citation and on the intrinsic problems related to it. Sheds light on aspects of mathematical complexity as encountered in, for example, fractal theory and Mandelbrot's law. Also discusses dynamical aspects of citation theory as reflected in evolutions of journal rankings, centres of gravity or of the set of source journals. Makes some comments in this connection on growth and obsolescence

0.004707306 = product of:
  0.018829225 = sum of:
    0.018829225 = product of:
      0.03765845 = sum of:
        0.03765845 = weight(_text_:22 in 7659) [ClassicSimilarity], result of:
          0.03765845 = score(doc=7659,freq=2.0), product of:
            0.16222252 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.046325076 = queryNorm
            0.23214069 = fieldWeight in 7659, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.046875 = fieldNorm(doc=7659)
      0.5 = coord(1/2)
  0.25 = coord(1/4)

Source

Journal of information science. 22(1996) no.3, S.165-170