Combining Philosophers
Ideas for Theodosius, Engelbretsen,G/Sayward,C and Blaise Pascal
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5 ideas
5. Theory of Logic / A. Overview of Logic / 4. Pure Logic
13850
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In modern logic all formal validity can be characterised syntactically [Engelbretsen/Sayward]
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5. Theory of Logic / A. Overview of Logic / 6. Classical Logic
13849
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Classical logic rests on truth and models, where constructivist logic rests on defence and refutation [Engelbretsen/Sayward]
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5. Theory of Logic / D. Assumptions for Logic / 3. Contradiction
10121
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Contradiction is not a sign of falsity, nor lack of contradiction a sign of truth [Pascal]
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5. Theory of Logic / D. Assumptions for Logic / 4. Identity in Logic
13851
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Unlike most other signs, = cannot be eliminated [Engelbretsen/Sayward]
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5. Theory of Logic / K. Features of Logics / 5. Incompleteness
13852
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Axioms are ω-incomplete if the instances are all derivable, but the universal quantification isn't [Engelbretsen/Sayward]
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