Combining Philosophers

Ideas for Eubulides, Hesiod and Engelbretsen,G/Sayward,C

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7 ideas

5. Theory of Logic / A. Overview of Logic / 4. Pure Logic

13850

In modern logic all formal validity can be characterised syntactically [Engelbretsen/Sayward]

5. Theory of Logic / A. Overview of Logic / 6. Classical Logic

13849

Classical logic rests on truth and models, where constructivist logic rests on defence and refutation [Engelbretsen/Sayward]

5. Theory of Logic / D. Assumptions for Logic / 4. Identity in Logic

13851

Unlike most other signs, = cannot be eliminated [Engelbretsen/Sayward]

5. Theory of Logic / K. Features of Logics / 5. Incompleteness

13852

Axioms are ω-incomplete if the instances are all derivable, but the universal quantification isn't [Engelbretsen/Sayward]

5. Theory of Logic / L. Paradox / 1. Paradox

6007	If you know your father, but don't recognise your father veiled, you know and don't know the same person [Eubulides, by Dancy,R]

5. Theory of Logic / L. Paradox / 6. Paradoxes in Language / a. The Liar paradox

6006	If you say truly that you are lying, you are lying [Eubulides, by Dancy,R]

5. Theory of Logic / L. Paradox / 6. Paradoxes in Language / b. The Heap paradox ('Sorites')

6008	Removing one grain doesn't destroy a heap, so a heap can't be destroyed [Eubulides, by Dancy,R]