Abstract
Under ZF, we show that the statement that every subset of every R-vector space has a maximal convex subset is equivalent to the Axiom of Choice. We also study the strength of the same statement restricted to some specific R-vector spaces. In particular, we show that the statement for R^2 is equivalent to the Axiom of Countable Choice for reals, whereas the statement for R^3 is equivalent to the Axiom of Uniformization. We discuss the statement for some spaces of higher dimensions as well.
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