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  E-mail Message: I thought you might be interested in this item at http://www.worldcat.org/oclc/375477 Title: Natural deduction; a proof-theoretical study. Author: Dag Prawitz Publisher: Stockholm, Almqvist & Wiksell [1965] OCLC:375477

  
  

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• Logic.
• Logic, Symbolic and mathematical.
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Natural deduction; a proof-theoretical study.