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Is the non-triviality of the algebraic dual of an infinite-dimensional vector space equivalent to the axiom of choice?

oct 29 11 at 0:10 Asaf Karagila 7,243●1●14●44

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Does every non-empty set admit a group structure (in ZF)?

nov 2 11 at 21:30 Justin Palumbo 2,139●1●7●17

 
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Number of spanning trees in a grid

jan 7 10 at 12:41 Martin Rubey 1,447●5●13