用三段論基本規(guī)則證明第一格的小前提必須是肯定的。
結(jié)論是全稱判斷的有效三段論，其中項(xiàng)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
根據(jù)如果小前提是否定的，那么根據(jù)規(guī)則五（如果前提有否定，那么結(jié)論否定）結(jié)論也是否定的，這樣大項(xiàng)在結(jié)論中周延。根據(jù)規(guī)則三（在前提中不周延的項(xiàng)，到結(jié)論中也不得周延）那么大項(xiàng)在大前提中也必須周延。在第一格中，大項(xiàng)是大前提的謂項(xiàng)，大項(xiàng)要在大前提中周延，則大前提必須是否定的。根據(jù)規(guī)則四（兩個否定前提得不出結(jié)論）。所以假設(shè)不成立，小前提必須是肯定的。
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