9 lines
268 B
Text
9 lines
268 B
Text
constant {u} f {α : Type u} : α → α → α → α
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axiom {u} fax {α : Type u} [ring α] (a b : α) : f a b a = 0
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attribute [ematch] fax
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universe variables u
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lemma ex {α : Type u} [field α] (x y : α) : f (x + y) (y + x) (x + y) = 0 :=
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begin [smt] ematch end
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