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Ideas for 'On the Question of Absolute Undecidability', 'Mathematical logic and theory of types' and 'In Defense of Essentialism'

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2 ideas

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

17894

We have no argument to show a statement is absolutely undecidable [Koellner]

5. Theory of Logic / L. Paradox / 5. Paradoxes in Set Theory / d. Russell's paradox

6407	The class of classes which lack self-membership leads to a contradiction [Russell, by Grayling]