In <virgil-D05694.firstname.lastname@example.org>, on 02/19/2012 at 01:50 AM, Virgil <email@example.com> said:
>But one need not assume the axiom of choice.
Also, if one assumes the AOC then it is possible to preserve more than just the additive structures. In fact, any group isomorphism between R and C is also an isomorphism between R and C as vector spaces over Q.
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