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within Zermelo-Fraenkel set theory with or without the axiom of choice (provided Zermelo-Fraenkel set theory is consistent, i.e., it does not contain a contradiction). There is no consensus on whether this is a solution to the problem.}}|style="text-align:center" data-sort-value="1940" | 1940, 1963?|-|style="text-align:center"| 2nd| Prove that the axioms

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