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Ideas for 'On the Question of Absolute Undecidability', 'Principia Mathematica' and 'works'

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6. Mathematics / A. Nature of Mathematics / 3. Nature of Numbers / i. Reals from cuts

18248

A real number is the class of rationals less than the number [Russell/Whitehead, by Shapiro]

6. Mathematics / A. Nature of Mathematics / 5. The Infinite / i. Cardinal infinity

17890

There are at least eleven types of large cardinal, of increasing logical strength [Koellner]