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lean2/tests/lean/j5.lean
Leonardo de Moura b7b868de85 fix(library/elaborator): bug reported by Jeremy Avigad 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
2014-02-10 14:01:22 -08:00

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theorem or_imp (p q : Bool) : (p ∨ q) ↔ (¬ p → q)
:= subst (symm (imp_or (¬ p) q)) (not_not_eq p)
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