Journal of Hebei University (Natural Science Edition) ›› 2009, Vol. 29 ›› Issue (3): 238-240.DOI: 10.3969/j.issn.1000-1565.2009.03.005

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P∧Q(→)P in Natural Deduction System P

MENG Ling-jiang   

  • Online:2009-05-25 Published:2009-05-25

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