Moreover, the negative words not, no, &c., have two kinds of meaning which must be carefully distinguished. Sometimes they deny, and nothing more : sometimes they are used to affirm the direct contrary. In cases which offer but two alternatives, one of... First Notions of Logic: (preparatory to the Study of Geometry) - Pàgina 5 per Augustus De Morgan - 1840 - 32 pàgines Visualització completa -
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