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'works', 'Words without Objects' and 'Negation'
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11 ideas
5. Theory of Logic / A. Overview of Logic / 6. Classical Logic
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In classical logic the connectives can be related elegantly, as in De Morgan's laws [Mares]
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Material implication (and classical logic) considers nothing but truth values for implications [Mares]
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5. Theory of Logic / D. Assumptions for Logic / 1. Bivalence
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Excluded middle standardly implies bivalence; attacks use non-contradiction, De M 3, or double negation [Mares]
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Standard disjunction and negation force us to accept the principle of bivalence [Mares]
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5. Theory of Logic / E. Structures of Logic / 1. Logical Form
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For Aristotle, the subject-predicate structure of Greek reflected a substance-accident structure of reality [Aristotle, by O'Grady]
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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives
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The connectives are studied either through model theory or through proof theory [Mares]
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5. Theory of Logic / E. Structures of Logic / 4. Variables in Logic
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If plural variables have 'some values', then non-count variables have 'some value' [Laycock]
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5. Theory of Logic / G. Quantification / 6. Plural Quantification
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Plurals are semantical but not ontological [Laycock]
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5. Theory of Logic / H. Proof Systems / 4. Natural Deduction
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Many-valued logics lack a natural deduction system [Mares]
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5. Theory of Logic / I. Semantics of Logic / 1. Semantics of Logic
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Situation semantics for logics: not possible worlds, but information in situations [Mares]
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5. Theory of Logic / K. Features of Logics / 2. Consistency
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Consistency is semantic, but non-contradiction is syntactic [Mares]
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