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isabelle - proof (rule disjE) for nested disjunction
    In Isar-style Isabelle proofs, this works nicely: from `a ∨ b` have foo proof assume a show foo sorry next ... next assume c show foo sorry qed See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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