John Natawabe

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visits member for 9 months
seen Sep 18 '12 at 6:13
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Sep
18
 asked Confusion regarding Russell's paradox
Sep
17
 accepted How to prove that Cantor's normal form can produce all ordinal numbers
Sep
17
 accepted How to prove that $\epsilon_0$ exists?
Sep
17
 accepted How to define countability of $\omega^{\omega}$ and $\omega_1$? in set theory?
Sep
17
 awarded  Scholar
Sep
17
 accepted How does one prove that there are uncountable number of countable ordinals?
Sep
17
 comment How does one prove that there are uncountable number of countable ordinals?
Well, I know why sup exists... but I guess that might be useful to include. Not sure. And obviously why countable set of countable numbers are countable - I know that. :)
Sep
17
 asked How does one prove that there are uncountable number of countable ordinals?
Sep
17
 asked How to prove that Cantor's normal form can produce all ordinal numbers
Sep
17
 awarded  Student
Sep
17
 asked How to prove that $\epsilon_0$ exists?
Sep
17
 awarded  Editor
Sep
17
 comment How to define countability of $\omega^{\omega}$ and $\omega_1$? in set theory?
@MJD I changed the question a bit. Would you answer this question also? thanks.
Sep
17
 revised How to define countability of $\omega^{\omega}$ and $\omega_1$? in set theory?
added 143 characters in body; edited tags; edited title
Sep
17
 asked How to define countability of $\omega^{\omega}$ and $\omega_1$? in set theory?