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5. Theory of Logic / L. Paradox / 4. Paradoxes in Logic / d. Richard's paradox
[problem with defining a closed set of real numbers]
2 ideas
21565
Richard's puzzle uses the notion of 'definition' - but that cannot be defined
[Russell]
13369
By diagonalization we can define a real number that isn't in the definable set of reals
[Priest,G]