Assuming you do not reject the axiom of choice, every vector space has a basis. Is the fact that any infinite dimensional vector space has a basis useful in any important result or theorem?
LOL... ..and then u want to prove that a result does NOT depend on a choice of basis.The use of a basis for a vector space should be avoided where possible (IMHO). I have an idea where to look for an answer to the second question but I don't think that this is a very good way to validate AC.
So you will reject a proof simply because it is nonconstructive?
Not necessarily, depends on what kind of proof it is.. Let's say I prefer constructive proofs because I think u can, in general, learn more from them...
This is really more a question of philosophy than anything else, a strict constructivist would reject... For myself I have more in common with the constructivists than the ZFCers
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