11 lines
219 B
Text
11 lines
219 B
Text
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Defined: xor
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⊤ ⊕ ⊥
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⊥
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⊤
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Assumed: a
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a ⊕ a ⊕ a
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[33mΠ[0m (A : [36mType[0m u) (a b : A) (P : A [33m→[0m Bool) (H1 : P a) (H2 : a = b), P b
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Proved: EM2
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[33mΠ[0m a : Bool, a ∨ ¬ a
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a ∨ ¬ a
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