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'fragments/reports', 'Axiomatic Theories of Truth' and 'Three-Dimensionalism v Four-Dimensionalism'
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9 ideas
5. Theory of Logic / A. Overview of Logic / 6. Classical Logic
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The underestimated costs of giving up classical logic are found in mathematical reasoning [Halbach]
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5. Theory of Logic / B. Logical Consequence / 5. Modus Ponens
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Modus ponens is one of five inference rules identified by the Stoics [Chrysippus, by Devlin]
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5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle
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Every proposition is either true or false [Chrysippus, by Cicero]
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5. Theory of Logic / E. Structures of Logic / 8. Theories in Logic
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A theory is some formulae and all of their consequences [Halbach]
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5. Theory of Logic / K. Features of Logics / 3. Soundness
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Normally we only endorse a theory if we believe it to be sound [Halbach]
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Soundness must involve truth; the soundness of PA certainly needs it [Halbach]
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You cannot just say all of Peano arithmetic is true, as 'true' isn't part of the system [Halbach]
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5. Theory of Logic / L. Paradox / 1. Paradox
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Many new paradoxes may await us when we study interactions between frameworks [Halbach]
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5. Theory of Logic / L. Paradox / 6. Paradoxes in Language / a. The Liar paradox
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The liar paradox applies truth to a negated truth (but the conditional will serve equally) [Halbach]
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