feat: prove that omega-regular languages are closed under complementation#329
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ctchou wants to merge 52 commits intoleanprover:mainfrom
Open
feat: prove that omega-regular languages are closed under complementation#329ctchou wants to merge 52 commits intoleanprover:mainfrom
ctchou wants to merge 52 commits intoleanprover:mainfrom
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…n of omega-languages of a special form
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This PR reaches a major milestone by proving that omega-regular languages are closed under complementation, using W. Thomas's presentation of R. Büchi's original proof. Most of the groundwork has been laid in previous PRs and the only nontrivial theorem proved in this PR is
buchiFamily_coverin BuchiCongruence.lean, which uses the Ramsey theorem for infinite graphs.This PR depends on #281 and #325, the latter of which in turn depends on #278.