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@ -149,11 +149,13 @@ lemma2∙3∙8 {l} {A} {B} f {x} {y} p =
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### Lemma 2.3.11
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```
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-- lemma2311 : {A : Set} {P Q : A → Set} (f : (x : A) → P x → Q x)
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-- → {x y : A} (p : x ≡ y) → (u : P x)
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-- → transport Q p (f x u) ≡ f y (transport P p u)
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-- lemma2311 {A} {P} {Q} f {x} {y} p u =
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-- J (λ the what → transport Q what (f x u) ≡ f the (transport P what u)) p refl
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lemma2∙3∙11 : {A : Set} {P Q : A → Set}
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→ (f : (x : A) → P x → Q x)
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→ {x y : A} (p : x ≡ y) → (u : P x)
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→ transport Q p (f x u) ≡ f y (transport P p u)
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lemma2∙3∙11 {A} {P} {Q} f {x} {y} p u =
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J (λ a b p → transport Q p (f a {! !}) ≡ f b (transport P p {! !})) (λ a → {! !}) x y p
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-- J (λ the what → transport Q what (f x u) ≡ f the (transport P what u)) p refl
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```
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## 2.4 Homotopies and equivalences
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