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Results tagged with reference-request
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user 69236
This tag is used if a reference is needed in a paper or textbook on a specific result.
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Inaccessible cardinal and $\Sigma_1$ reflection
A theorem of A. Levy says that, if $\kappa$ is an inaccessible cardinal, then $V_\kappa\prec_{\Sigma_1}V$ namely $V_\kappa$ is an elementary submodel when considering only $\Sigma_1$ formulas.
Where …
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