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'On the Question of Absolute Undecidability', 'Principia Mathematica' and 'Letters to the Lord Marquis of Newcastle'
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6. Mathematics / A. Nature of Mathematics / 3. Nature of Numbers / i. Reals from cuts
18248
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A real number is the class of rationals less than the number [Russell/Whitehead, by Shapiro]
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6. Mathematics / A. Nature of Mathematics / 5. The Infinite / i. Cardinal infinity
17890
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There are at least eleven types of large cardinal, of increasing logical strength [Koellner]
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