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5 ideas
5. Theory of Logic / A. Overview of Logic / 6. Classical Logic
4705
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Logical relativism appears if we allow more than one legitimate logical system [O'Grady]
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5. Theory of Logic / D. Assumptions for Logic / 1. Bivalence
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A third value for truth might be "indeterminate", or a point on a scale between 'true' and 'false' [O'Grady]
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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives
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Wittgenstein reduced Russell's five primitive logical symbols to a mere one [O'Grady]
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5. Theory of Logic / G. Quantification / 1. Quantification
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Traditionally, universal sentences had existential import, but were later treated as conditional claims [Orenstein]
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5. Theory of Logic / G. Quantification / 4. Substitutional Quantification
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The substitution view of quantification says a sentence is true when there is a substitution instance [Orenstein]
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