Predicate logic
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reason: Article should clarify syntactic-semantic distinction here, e.g. second-order logic can be interpreted as a many-sorted first-order logic, so syntactically it could be argued that it's not more expressive, and it admits categorical axiomatizations only using full semantics, but using Henkin semantics it is a conservative extension of the typical semantics for first-order logic. So really the article needs to clarify whether it is discussing FOL exclusively as a syntactic system, or as a syntactic and semantic system, and in either case clarify in which senses "extensions" of first-order logic are being assumed to extend it .
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subject: Category:Predicate logic
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description: koleksi sistem formal yang digunakan dalam bidang matematika, linguistik dan ilmu komputer @in
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label: Lógica de primeira ordem @pt
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label: 一阶逻辑 @zh
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label: First-order logic
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label: Logika predikat tingkat pertama @in
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description: 使用於數學、哲學、語言學及電腦科學中的一種形式系統 @zh
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date: January 2023
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