Page "Constructivism (mathematics)" Paragraph 21
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The status of the axiom of choice in constructive mathematics is complicated by the different approaches of different constructivist programs.
One trivial meaning of " constructive ", used informally by mathematicians, is " provable in ZF set theory without the axiom of choice.
" However, proponents of more limited forms of constructive mathematics would not assert that ZF itself is a constructive system.
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