14 lines
311 B
Text
14 lines
311 B
Text
def OrderDual (α : Type u) : Type u := α
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variable (α : Type u) [LE α] {a b : α}
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instance : LE (OrderDual α) := ⟨fun x y : α => y ≤ x⟩
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theorem foo' (c : α) : a ≤ b := sorry
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example : a ≤ b :=
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foo' (OrderDual α) a
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theorem foo : a ≤ b := sorry
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example : a ≤ b :=
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foo (OrderDual α)
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