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Leonardo de Moura e9dada5e14 refactor(builtin/kernel): use standard definition for 'or' and 'and' 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
2014-02-17 12:05:34 -08:00

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theorem or_imp2 (p q : Bool) : (p ∨ q) ↔ (¬ p → q)
:= subst (symm (imp_or (¬ p) q)) (not_not_eq p)
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