Timeline for Is the collection of isomorphism classes of groups a proper class?
Current License: CC BY-SA 2.5
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| Jan 25, 2010 at 13:10 | comment | added | Gerald Edgar | An my thought was: direct sum of copies of Q. I.e., the dimension of the vector space. For every cardinal there is a vector space with that dimension, and spaces with different dimension (over Q) are not isomorphic as groups. | |
| Jan 25, 2010 at 9:09 | history | answered | Gerhard Paseman | CC BY-SA 2.5 |