15 lines
300 B
Text
15 lines
300 B
Text
open quot setoid
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variables A B : Type₁
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variable s : setoid A
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include s
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variable f : A → B
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variable c : ∀ a₁ a₂, a₁ ≈ a₂ → f a₁ = f a₂
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example (a : A) (g h : B → B) : g = h → g (quot.lift_on ⟦a⟧ f c) = h (f a) :=
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begin
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intro gh,
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esimp,
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state,
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rewrite gh
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end
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