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'On the Question of Absolute Undecidability', 'Presupposition' and 'Principia Mathematica'
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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / c. not
19052
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Natural language 'not' doesn't apply to sentences [Dummett]
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5. Theory of Logic / E. Structures of Logic / 6. Relations in Logic
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In 'Principia' a new abstract theory of relations appeared, and was applied [Russell/Whitehead, by Gödel]
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