12 lines
238 B
Text
12 lines
238 B
Text
Set: pp::colors
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Set: pp::unicode
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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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@subst : ∀ (A : TypeU) (a b : A) (P : A → Bool), P a → a = b → P b
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Proved: EM2
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EM2 : ∀ a : Bool, a ∨ ¬ a
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EM2 a : a ∨ ¬ a
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