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- {{About|the study of correct reasoning||Logic (disambiguation)|and|Logician (disamb ...ntury, many new formal systems have been proposed. There are disagreements about what makes a formal system a logic.{{sfnm|1a1=Haack|1y=1978|1loc=Philosophy ...145 KB (20,377 words) - 19:04, 1 March 2025
- ...ntains no logical connectives or quantifiers, expressing a basic statement about objects.}} ...//books.google.com/books?id=PsDmCwAAQBAJ |title=The Reason's Proper Study: Essays Towards a Neo-Fregean Philosophy of Mathematics |last2=Wright |first2=Crisp ...270 KB (38,241 words) - 06:11, 6 January 2025