結(jié)論是全稱判斷的有效三段論，其中項不能周延兩次。
結(jié)論是全稱判斷的有效三段論，其中項不能周延兩次。
用三段論基本規(guī)則證明第一格的小前提必須是肯定的。
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三段論的格
假設(shè)中項周延兩次，則有：因為結(jié)論是全稱判斷的有效三段論，所以小項周延，因為前提中不周延的項在結(jié)論中得不到周延，所以小項在前提 中必周延；假設(shè)中項周延兩次，則在前提中必須至少有三個項周延，這樣在前提中必有一全稱否定判斷，因此結(jié)論必為否定；這樣，大項在結(jié)論中周延，因為前提中不周延的項在結(jié)論中不得周延，所以大項在前提中必周延；這樣前提中四個項都必須周延，那兩個前提只能都是E判斷，而一個有效三段論的兩個前提不能都否定。所以結(jié)論是全稱判斷的有效三段論，其中項不能周延兩次。
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