Haoyi's code from the BDP paper #9
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JoJoDeveloping
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I'm merging this, but note that I already manually included it in the Rocq 9.0 branch. |
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This PR adds @HaoyiZeng 's code from the BDP paper. I've just ported it to the library / current Coq version and cleaned it up a bit. The main results are collected in
AnalysisLS.vwhich gives equivalences of the (countable) downward Löwenheim-Skolem theorem to certain fragments of AC and LEM. These principles and others are collected inLogicalPrinciples.vwhich is a file actually independent of FOL definitions but could for simplicity still be kept in the ModelTheory folder for now.