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This tag is for questions about proving that some statement is independent from a theory, meaning it is neither provable nor refutable from that theory. Common examples are the continuum hypothesis from the axioms of ZFC, and the axiom of choice from the axioms of ZF.
12
votes
Minimal subset of axioms for ZFC
I pondered this question some time ago. As pointed out by Stefan Geschke, infinity and power set are indispensable. Moreover:
The replacement or collection schema is indispensable: $V_{\omega+\omega …