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>> No.11624024 [View]
File: 144 KB, 983x730, absoluteness.png [View same] [iqdb] [saucenao] [google]
11624024

Hey ZFCbros, how does this proof work? As far as I can tell, Jech only proved that it's [math]\Sigma_1[/math]. Why is it also [math]\Pi_1[/math]? This is page 187 of Jech.

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