6 lines
200 B
Text
6 lines
200 B
Text
Set: pp::colors
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Set: pp::unicode
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Proved: T1
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Proved: T2
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Theorem T2 (a b : Bool) : a ∨ b ⇒ b ∨ a :=
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Discharge (λ H : a ∨ b, DisjCases H (λ H : a, Disj2 b H) (λ H : b, Disj1 a H))
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