Timeline for A set for which it is hard to determine whether or not it is countable.
Current License: CC BY-SA 2.5
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| Mar 22, 2011 at 12:37 | comment | added | Pete L. Clark | +1: also you should ask about the set of isomorphism classes of all $n$-dimensional Lie algebras over a field (why not?). | |
| Mar 22, 2011 at 3:06 | history | answered | ndkrempel | CC BY-SA 2.5 |