Combining Texts
Ideas for
'On the Question of Absolute Undecidability', 'Principia Mathematica' and 'Philosophy and the Mirror of Nature'
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5 ideas
5. Theory of Logic / B. Logical Consequence / 7. Strict Implication
8204
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Lewis's 'strict implication' preserved Russell's confusion of 'if...then' with implication [Quine on Russell/Whitehead]
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Russell's implication means that random sentences imply one another [Lewis,CI on Russell/Whitehead]
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5. Theory of Logic / C. Ontology of Logic / 1. Ontology of Logic
21707
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Russell unusually saw logic as 'interpreted' (though very general, and neutral) [Russell/Whitehead, by Linsky,B]
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5. Theory of Logic / E. Structures of Logic / 6. Relations in Logic
10036
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In 'Principia' a new abstract theory of relations appeared, and was applied [Russell/Whitehead, by Gödel]
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5. Theory of Logic / K. Features of Logics / 5. Incompleteness
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We have no argument to show a statement is absolutely undecidable [Koellner]
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