6 lines
196 B
Text
6 lines
196 B
Text
Set: pp::colors
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Set: pp::unicode
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Imported 'tactic'
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Proved: T1
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Proved: T2
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theorem T2 (a b : Bool) (H : a ∨ b) : b ∨ a := or_elim H (λ H : a, or_intror b H) (λ H : b, or_introl H a)
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