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'Wiener Logik', 'Metaphysics: the logical approach' and 'Mathematical logic and theory of types'
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5. Theory of Logic / A. Overview of Logic / 3. Value of Logic
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Logic gives us the necessary rules which show us how we ought to think [Kant]
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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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