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'On the Question of Absolute Undecidability', 'Tractatus Logico-Philosophicus' and 'The Foundations of Mathematics (2nd ed)'
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3 ideas
8. Modes of Existence / A. Relations / 2. Internal Relations
7969
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The order of numbers is an internal relation, not an external one [Wittgenstein]
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7968
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A relation is internal if it is unthinkable that its object should not possess it [Wittgenstein]
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8. Modes of Existence / A. Relations / 4. Formal Relations / b. Equivalence relation
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An 'equivalence' relation is one which is reflexive, symmetric and transitive [Kunen]
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