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This tag is used if a reference is needed in a paper or textbook on a specific result.
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Reference request: for a proof of a reflection [from transitive sets] based axiomatization o...
This was actually a result I used in a paper I am working on.
Let $M$ reflect $\exists x(x\in X\land\phi(x,y))$ (In this case $\phi(x,y)↔y=f(x)$). Then $\{y│(M,∈)\vDash\exists x(x\in X\land\phi(x,y)) …