[mizar] New Mizar articles

[Library Committee <mml@mizar.uwb.edu.pl>]

Mariusz Giero submitted an article entitled:
      "Hierarchies and Classifications of Sets"
        (MML identifier: TAXONOM2)
 
to the Mizar Mathematical Library.  The preprint of the article is
available at:
  
 http://mizar.org/JFM/Preprints.html

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Library Committee of the Association of Mizar Users