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'On the Question of Absolute Undecidability', 'works' and 'Mathematical logic and theory of types'
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5. Theory of Logic / K. Features of Logics / 5. Incompleteness
17894
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We have no argument to show a statement is absolutely undecidable [Koellner]
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5. Theory of Logic / L. Paradox / 5. Paradoxes in Set Theory / d. Russell's paradox
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The class of classes which lack self-membership leads to a contradiction [Russell, by Grayling]
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