Document (#20956)

Author
Frants, V.I.
Shapiro, J.
Taksa, I.
Voiskunskii, V.G.
Title
Boolean search : current state and perspectives
Source
Journal of the American Society for Information Science. 50(1999) no.1, S.86-95
Year
1999
Abstract
Most of the operational information retrieval (IR) systems in existence today use Boolean logic during search. Such systems are usually called Boolean IR systems. These systems, as any other IR systems, are not perfect and the problem of their development (and hence providing better quality service for real users) is one of the most important problems in information science. From this viewpoint, the article analyzes existing criticisms of operational systems and points out some of their positive features. At the same time, certain negative effects which hinder the development of existing systems are considered. Finally, the article provides several conclusions about using Boolean logic in developing multiversion IR systems
Object
SMART

Similar documents (author)

  1. Frants, V.I.; Shapiro, J.; Voiskunskii, V.G.: Optimal search available to an individual user (1996) 6.24
    6.240326 = sum of:
      6.240326 = sum of:
        1.8553525 = weight(author_txt:shapiro in 773) [ClassicSimilarity], result of:
          1.8553525 = score(doc=773,freq=1.0), product of:
            0.5345996 = queryWeight, product of:
              9.254789 = idf(docFreq=10, maxDocs=42306)
              0.057764646 = queryNorm
            3.470546 = fieldWeight in 773, product of:
              1.0 = tf(freq=1.0), with freq of:
                1.0 = termFreq=1.0
              9.254789 = idf(docFreq=10, maxDocs=42306)
              0.375 = fieldNorm(doc=773)
        2.1406791 = weight(author_txt:frants in 773) [ClassicSimilarity], result of:
          2.1406791 = score(doc=773,freq=1.0), product of:
            0.58809215 = queryWeight, product of:
              1.0488379 = boost
              9.706774 = idf(docFreq=6, maxDocs=42306)
              0.057764646 = queryNorm
            3.6400402 = fieldWeight in 773, product of:
              1.0 = tf(freq=1.0), with freq of:
                1.0 = termFreq=1.0
              9.706774 = idf(docFreq=6, maxDocs=42306)
              0.375 = fieldNorm(doc=773)
        2.244294 = weight(author_txt:voiskunskii in 773) [ClassicSimilarity], result of:
          2.244294 = score(doc=773,freq=1.0), product of:
            0.6069191 = queryWeight, product of:
              1.0654942 = boost
              9.860925 = idf(docFreq=5, maxDocs=42306)
              0.057764646 = queryNorm
            3.697847 = fieldWeight in 773, product of:
              1.0 = tf(freq=1.0), with freq of:
                1.0 = termFreq=1.0
              9.860925 = idf(docFreq=5, maxDocs=42306)
              0.375 = fieldNorm(doc=773)
    
  2. Frants, V.I.; Voiskunskii, V.G.; Shapiro, J.: Automated information retrieval : theory and methods (1997) 6.24
    6.240326 = sum of:
      6.240326 = sum of:
        1.8553525 = weight(author_txt:shapiro in 2791) [ClassicSimilarity], result of:
          1.8553525 = score(doc=2791,freq=1.0), product of:
            0.5345996 = queryWeight, product of:
              9.254789 = idf(docFreq=10, maxDocs=42306)
              0.057764646 = queryNorm
            3.470546 = fieldWeight in 2791, product of:
              1.0 = tf(freq=1.0), with freq of:
                1.0 = termFreq=1.0
              9.254789 = idf(docFreq=10, maxDocs=42306)
              0.375 = fieldNorm(doc=2791)
        2.1406791 = weight(author_txt:frants in 2791) [ClassicSimilarity], result of:
          2.1406791 = score(doc=2791,freq=1.0), product of:
            0.58809215 = queryWeight, product of:
              1.0488379 = boost
              9.706774 = idf(docFreq=6, maxDocs=42306)
              0.057764646 = queryNorm
            3.6400402 = fieldWeight in 2791, product of:
              1.0 = tf(freq=1.0), with freq of:
                1.0 = termFreq=1.0
              9.706774 = idf(docFreq=6, maxDocs=42306)
              0.375 = fieldNorm(doc=2791)
        2.244294 = weight(author_txt:voiskunskii in 2791) [ClassicSimilarity], result of:
          2.244294 = score(doc=2791,freq=1.0), product of:
            0.6069191 = queryWeight, product of:
              1.0654942 = boost
              9.860925 = idf(docFreq=5, maxDocs=42306)
              0.057764646 = queryNorm
            3.697847 = fieldWeight in 2791, product of:
              1.0 = tf(freq=1.0), with freq of:
                1.0 = termFreq=1.0
              9.860925 = idf(docFreq=5, maxDocs=42306)
              0.375 = fieldNorm(doc=2791)
    
  3. Frants, V.I.; Shapiro, J.: Control and feedback in a documentary information retrieval system (1991) 3.55
    3.5520282 = sum of:
      3.5520282 = product of:
        5.328042 = sum of:
          2.4738033 = weight(author_txt:shapiro in 416) [ClassicSimilarity], result of:
            2.4738033 = score(doc=416,freq=1.0), product of:
              0.5345996 = queryWeight, product of:
                9.254789 = idf(docFreq=10, maxDocs=42306)
                0.057764646 = queryNorm
              4.6273947 = fieldWeight in 416, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                9.254789 = idf(docFreq=10, maxDocs=42306)
                0.5 = fieldNorm(doc=416)
          2.8542387 = weight(author_txt:frants in 416) [ClassicSimilarity], result of:
            2.8542387 = score(doc=416,freq=1.0), product of:
              0.58809215 = queryWeight, product of:
                1.0488379 = boost
                9.706774 = idf(docFreq=6, maxDocs=42306)
                0.057764646 = queryNorm
              4.853387 = fieldWeight in 416, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                9.706774 = idf(docFreq=6, maxDocs=42306)
                0.5 = fieldNorm(doc=416)
        0.6666667 = coord(2/3)
    
  4. Frants, V.I.; Kamenoff, N.I.; Shapiro, J.: ¬One approach to classification of users and automatic clustering of documents (1993) 2.66
    2.6640213 = sum of:
      2.6640213 = product of:
        3.9960318 = sum of:
          1.8553525 = weight(author_txt:shapiro in 4569) [ClassicSimilarity], result of:
            1.8553525 = score(doc=4569,freq=1.0), product of:
              0.5345996 = queryWeight, product of:
                9.254789 = idf(docFreq=10, maxDocs=42306)
                0.057764646 = queryNorm
              3.470546 = fieldWeight in 4569, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                9.254789 = idf(docFreq=10, maxDocs=42306)
                0.375 = fieldNorm(doc=4569)
          2.1406791 = weight(author_txt:frants in 4569) [ClassicSimilarity], result of:
            2.1406791 = score(doc=4569,freq=1.0), product of:
              0.58809215 = queryWeight, product of:
                1.0488379 = boost
                9.706774 = idf(docFreq=6, maxDocs=42306)
                0.057764646 = queryNorm
              3.6400402 = fieldWeight in 4569, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                9.706774 = idf(docFreq=6, maxDocs=42306)
                0.375 = fieldNorm(doc=4569)
        0.6666667 = coord(2/3)
    
  5. Voiskunskii, V.G.: Evaluation of search results : a new approach (1997) 1.25
    1.24683 = sum of:
      1.24683 = product of:
        3.7404897 = sum of:
          3.7404897 = weight(author_txt:voiskunskii in 778) [ClassicSimilarity], result of:
            3.7404897 = score(doc=778,freq=1.0), product of:
              0.6069191 = queryWeight, product of:
                1.0654942 = boost
                9.860925 = idf(docFreq=5, maxDocs=42306)
                0.057764646 = queryNorm
              6.163078 = fieldWeight in 778, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                9.860925 = idf(docFreq=5, maxDocs=42306)
                0.625 = fieldNorm(doc=778)
        0.33333334 = coord(1/3)
    

Similar documents (content)

  1. Bednarek, A.R.: Boolean algebras (2009) 0.21
    0.21120267 = sum of:
      0.21120267 = product of:
        1.0560133 = sum of:
          0.060033172 = weight(abstract_txt:search in 758) [ClassicSimilarity], result of:
            0.060033172 = score(doc=758,freq=2.0), product of:
              0.09289589 = queryWeight, product of:
                1.3141376 = boost
                3.6556938 = idf(docFreq=2971, maxDocs=42306)
                0.019336855 = queryNorm
              0.6462414 = fieldWeight in 758, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                3.6556938 = idf(docFreq=2971, maxDocs=42306)
                0.125 = fieldNorm(doc=758)
          0.054356746 = weight(abstract_txt:most in 758) [ClassicSimilarity], result of:
            0.054356746 = score(doc=758,freq=1.0), product of:
              0.10954215 = queryWeight, product of:
                1.4270304 = boost
                3.969741 = idf(docFreq=2170, maxDocs=42306)
                0.019336855 = queryNorm
              0.49621764 = fieldWeight in 758, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                3.969741 = idf(docFreq=2170, maxDocs=42306)
                0.125 = fieldNorm(doc=758)
          0.21305586 = weight(abstract_txt:logic in 758) [ClassicSimilarity], result of:
            0.21305586 = score(doc=758,freq=1.0), product of:
              0.2723169 = queryWeight, product of:
                2.2499864 = boost
                6.2590566 = idf(docFreq=219, maxDocs=42306)
                0.019336855 = queryNorm
              0.7823821 = fieldWeight in 758, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                6.2590566 = idf(docFreq=219, maxDocs=42306)
                0.125 = fieldNorm(doc=758)
          0.5898648 = weight(abstract_txt:boolean in 758) [ClassicSimilarity], result of:
            0.5898648 = score(doc=758,freq=2.0), product of:
              0.5369254 = queryWeight, product of:
                4.4680142 = boost
                6.214605 = idf(docFreq=229, maxDocs=42306)
                0.019336855 = queryNorm
              1.0985973 = fieldWeight in 758, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                6.214605 = idf(docFreq=229, maxDocs=42306)
                0.125 = fieldNorm(doc=758)
          0.13870278 = weight(abstract_txt:systems in 758) [ClassicSimilarity], result of:
            0.13870278 = score(doc=758,freq=1.0), product of:
              0.32470506 = queryWeight, product of:
                4.913796 = boost
                3.4173236 = idf(docFreq=3771, maxDocs=42306)
                0.019336855 = queryNorm
              0.42716545 = fieldWeight in 758, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                3.4173236 = idf(docFreq=3771, maxDocs=42306)
                0.125 = fieldNorm(doc=758)
        0.2 = coord(5/25)
    
  2. Topi, H.; Lucas, W.: Searching the Web : operator assistance required (2005) 0.21
    0.20752779 = sum of:
      0.20752779 = product of:
        0.8646991 = sum of:
          0.048942346 = weight(abstract_txt:effects in 3013) [ClassicSimilarity], result of:
            0.048942346 = score(doc=3013,freq=1.0), product of:
              0.110901855 = queryWeight, product of:
                1.0153061 = boost
                5.648797 = idf(docFreq=404, maxDocs=42306)
                0.019336855 = queryNorm
              0.44131225 = fieldWeight in 3013, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.648797 = idf(docFreq=404, maxDocs=42306)
                0.078125 = fieldNorm(doc=3013)
          0.058047194 = weight(abstract_txt:positive in 3013) [ClassicSimilarity], result of:
            0.058047194 = score(doc=3013,freq=1.0), product of:
              0.124261454 = queryWeight, product of:
                1.0747212 = boost
                5.979361 = idf(docFreq=290, maxDocs=42306)
                0.019336855 = queryNorm
              0.46713758 = fieldWeight in 3013, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.979361 = idf(docFreq=290, maxDocs=42306)
                0.078125 = fieldNorm(doc=3013)
          0.08389891 = weight(abstract_txt:search in 3013) [ClassicSimilarity], result of:
            0.08389891 = score(doc=3013,freq=10.0), product of:
              0.09289589 = queryWeight, product of:
                1.3141376 = boost
                3.6556938 = idf(docFreq=2971, maxDocs=42306)
                0.019336855 = queryNorm
              0.9031499 = fieldWeight in 3013, product of:
                3.1622777 = tf(freq=10.0), with freq of:
                  10.0 = termFreq=10.0
                3.6556938 = idf(docFreq=2971, maxDocs=42306)
                0.078125 = fieldNorm(doc=3013)
          0.033972964 = weight(abstract_txt:most in 3013) [ClassicSimilarity], result of:
            0.033972964 = score(doc=3013,freq=1.0), product of:
              0.10954215 = queryWeight, product of:
                1.4270304 = boost
                3.969741 = idf(docFreq=2170, maxDocs=42306)
                0.019336855 = queryNorm
              0.31013602 = fieldWeight in 3013, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                3.969741 = idf(docFreq=2170, maxDocs=42306)
                0.078125 = fieldNorm(doc=3013)
          0.18831655 = weight(abstract_txt:logic in 3013) [ClassicSimilarity], result of:
            0.18831655 = score(doc=3013,freq=2.0), product of:
              0.2723169 = queryWeight, product of:
                2.2499864 = boost
                6.2590566 = idf(docFreq=219, maxDocs=42306)
                0.019336855 = queryNorm
              0.6915346 = fieldWeight in 3013, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                6.2590566 = idf(docFreq=219, maxDocs=42306)
                0.078125 = fieldNorm(doc=3013)
          0.45152116 = weight(abstract_txt:boolean in 3013) [ClassicSimilarity], result of:
            0.45152116 = score(doc=3013,freq=3.0), product of:
              0.5369254 = queryWeight, product of:
                4.4680142 = boost
                6.214605 = idf(docFreq=229, maxDocs=42306)
                0.019336855 = queryNorm
              0.8409384 = fieldWeight in 3013, product of:
                1.7320508 = tf(freq=3.0), with freq of:
                  3.0 = termFreq=3.0
                6.214605 = idf(docFreq=229, maxDocs=42306)
                0.078125 = fieldNorm(doc=3013)
        0.24 = coord(6/25)
    
  3. Poynder, R.: Web research engines? (1996) 0.18
    0.18303348 = sum of:
      0.18303348 = product of:
        0.7626395 = sum of:
          0.02518419 = weight(abstract_txt:their in 699) [ClassicSimilarity], result of:
            0.02518419 = score(doc=699,freq=2.0), product of:
              0.07121436 = queryWeight, product of:
                1.1506053 = boost
                3.2007766 = idf(docFreq=4683, maxDocs=42306)
                0.019336855 = queryNorm
              0.3536392 = fieldWeight in 699, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                3.2007766 = idf(docFreq=4683, maxDocs=42306)
                0.078125 = fieldNorm(doc=699)
          0.06498782 = weight(abstract_txt:search in 699) [ClassicSimilarity], result of:
            0.06498782 = score(doc=699,freq=6.0), product of:
              0.09289589 = queryWeight, product of:
                1.3141376 = boost
                3.6556938 = idf(docFreq=2971, maxDocs=42306)
                0.019336855 = queryNorm
              0.699577 = fieldWeight in 699, product of:
                2.4494898 = tf(freq=6.0), with freq of:
                  6.0 = termFreq=6.0
                3.6556938 = idf(docFreq=2971, maxDocs=42306)
                0.078125 = fieldNorm(doc=699)
          0.048045028 = weight(abstract_txt:most in 699) [ClassicSimilarity], result of:
            0.048045028 = score(doc=699,freq=2.0), product of:
              0.10954215 = queryWeight, product of:
                1.4270304 = boost
                3.969741 = idf(docFreq=2170, maxDocs=42306)
                0.019336855 = queryNorm
              0.43859857 = fieldWeight in 699, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                3.969741 = idf(docFreq=2170, maxDocs=42306)
                0.078125 = fieldNorm(doc=699)
          0.1331599 = weight(abstract_txt:logic in 699) [ClassicSimilarity], result of:
            0.1331599 = score(doc=699,freq=1.0), product of:
              0.2723169 = queryWeight, product of:
                2.2499864 = boost
                6.2590566 = idf(docFreq=219, maxDocs=42306)
                0.019336855 = queryNorm
              0.4889888 = fieldWeight in 699, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                6.2590566 = idf(docFreq=219, maxDocs=42306)
                0.078125 = fieldNorm(doc=699)
          0.3686655 = weight(abstract_txt:boolean in 699) [ClassicSimilarity], result of:
            0.3686655 = score(doc=699,freq=2.0), product of:
              0.5369254 = queryWeight, product of:
                4.4680142 = boost
                6.214605 = idf(docFreq=229, maxDocs=42306)
                0.019336855 = queryNorm
              0.68662333 = fieldWeight in 699, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                6.214605 = idf(docFreq=229, maxDocs=42306)
                0.078125 = fieldNorm(doc=699)
          0.12259709 = weight(abstract_txt:systems in 699) [ClassicSimilarity], result of:
            0.12259709 = score(doc=699,freq=2.0), product of:
              0.32470506 = queryWeight, product of:
                4.913796 = boost
                3.4173236 = idf(docFreq=3771, maxDocs=42306)
                0.019336855 = queryNorm
              0.37756446 = fieldWeight in 699, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                3.4173236 = idf(docFreq=3771, maxDocs=42306)
                0.078125 = fieldNorm(doc=699)
        0.24 = coord(6/25)
    
  4. Tenopir, C.: Online databases : natural language searching with WIN (1993) 0.17
    0.17438515 = sum of:
      0.17438515 = product of:
        1.0899072 = sum of:
          0.060033172 = weight(abstract_txt:search in 7038) [ClassicSimilarity], result of:
            0.060033172 = score(doc=7038,freq=2.0), product of:
              0.09289589 = queryWeight, product of:
                1.3141376 = boost
                3.6556938 = idf(docFreq=2971, maxDocs=42306)
                0.019336855 = queryNorm
              0.6462414 = fieldWeight in 7038, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                3.6556938 = idf(docFreq=2971, maxDocs=42306)
                0.125 = fieldNorm(doc=7038)
          0.3013065 = weight(abstract_txt:logic in 7038) [ClassicSimilarity], result of:
            0.3013065 = score(doc=7038,freq=2.0), product of:
              0.2723169 = queryWeight, product of:
                2.2499864 = boost
                6.2590566 = idf(docFreq=219, maxDocs=42306)
                0.019336855 = queryNorm
              1.1064553 = fieldWeight in 7038, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                6.2590566 = idf(docFreq=219, maxDocs=42306)
                0.125 = fieldNorm(doc=7038)
          0.5898648 = weight(abstract_txt:boolean in 7038) [ClassicSimilarity], result of:
            0.5898648 = score(doc=7038,freq=2.0), product of:
              0.5369254 = queryWeight, product of:
                4.4680142 = boost
                6.214605 = idf(docFreq=229, maxDocs=42306)
                0.019336855 = queryNorm
              1.0985973 = fieldWeight in 7038, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                6.214605 = idf(docFreq=229, maxDocs=42306)
                0.125 = fieldNorm(doc=7038)
          0.13870278 = weight(abstract_txt:systems in 7038) [ClassicSimilarity], result of:
            0.13870278 = score(doc=7038,freq=1.0), product of:
              0.32470506 = queryWeight, product of:
                4.913796 = boost
                3.4173236 = idf(docFreq=3771, maxDocs=42306)
                0.019336855 = queryNorm
              0.42716545 = fieldWeight in 7038, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                3.4173236 = idf(docFreq=3771, maxDocs=42306)
                0.125 = fieldNorm(doc=7038)
        0.16 = coord(4/25)
    
  5. Borgman, C.L.; Hirsh, S.G.; Walter, V.A.; Gallagher, A.L.: Childrens searching behavior on browsing and keyword online catalogs : the Science Library Catalog project (1995) 0.15
    0.1480871 = sum of:
      0.1480871 = product of:
        0.5288825 = sum of:
          0.034259643 = weight(abstract_txt:effects in 2660) [ClassicSimilarity], result of:
            0.034259643 = score(doc=2660,freq=1.0), product of:
              0.110901855 = queryWeight, product of:
                1.0153061 = boost
                5.648797 = idf(docFreq=404, maxDocs=42306)
                0.019336855 = queryNorm
              0.3089186 = fieldWeight in 2660, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                5.648797 = idf(docFreq=404, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2660)
          0.0124655375 = weight(abstract_txt:their in 2660) [ClassicSimilarity], result of:
            0.0124655375 = score(doc=2660,freq=1.0), product of:
              0.07121436 = queryWeight, product of:
                1.1506053 = boost
                3.2007766 = idf(docFreq=4683, maxDocs=42306)
                0.019336855 = queryNorm
              0.17504247 = fieldWeight in 2660, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                3.2007766 = idf(docFreq=4683, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2660)
          0.037143633 = weight(abstract_txt:search in 2660) [ClassicSimilarity], result of:
            0.037143633 = score(doc=2660,freq=4.0), product of:
              0.09289589 = queryWeight, product of:
                1.3141376 = boost
                3.6556938 = idf(docFreq=2971, maxDocs=42306)
                0.019336855 = queryNorm
              0.39984152 = fieldWeight in 2660, product of:
                2.0 = tf(freq=4.0), with freq of:
                  4.0 = termFreq=4.0
                3.6556938 = idf(docFreq=2971, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2660)
          0.03363152 = weight(abstract_txt:most in 2660) [ClassicSimilarity], result of:
            0.03363152 = score(doc=2660,freq=2.0), product of:
              0.10954215 = queryWeight, product of:
                1.4270304 = boost
                3.969741 = idf(docFreq=2170, maxDocs=42306)
                0.019336855 = queryNorm
              0.307019 = fieldWeight in 2660, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                3.969741 = idf(docFreq=2170, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2660)
          0.09321194 = weight(abstract_txt:logic in 2660) [ClassicSimilarity], result of:
            0.09321194 = score(doc=2660,freq=1.0), product of:
              0.2723169 = queryWeight, product of:
                2.2499864 = boost
                6.2590566 = idf(docFreq=219, maxDocs=42306)
                0.019336855 = queryNorm
              0.34229216 = fieldWeight in 2660, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                6.2590566 = idf(docFreq=219, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2660)
          0.18248011 = weight(abstract_txt:boolean in 2660) [ClassicSimilarity], result of:
            0.18248011 = score(doc=2660,freq=1.0), product of:
              0.5369254 = queryWeight, product of:
                4.4680142 = boost
                6.214605 = idf(docFreq=229, maxDocs=42306)
                0.019336855 = queryNorm
              0.3398612 = fieldWeight in 2660, product of:
                1.0 = tf(freq=1.0), with freq of:
                  1.0 = termFreq=1.0
                6.214605 = idf(docFreq=229, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2660)
          0.13569012 = weight(abstract_txt:systems in 2660) [ClassicSimilarity], result of:
            0.13569012 = score(doc=2660,freq=5.0), product of:
              0.32470506 = queryWeight, product of:
                4.913796 = boost
                3.4173236 = idf(docFreq=3771, maxDocs=42306)
                0.019336855 = queryNorm
              0.4178873 = fieldWeight in 2660, product of:
                2.236068 = tf(freq=5.0), with freq of:
                  5.0 = termFreq=5.0
                3.4173236 = idf(docFreq=3771, maxDocs=42306)
                0.0546875 = fieldNorm(doc=2660)
        0.28 = coord(7/25)