fix(init/equiv): make transport not an instance
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2 changed files with 5 additions and 3 deletions
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@ -41,7 +41,7 @@ namespace is_equiv
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protected abbreviation mk [constructor] := @is_equiv.mk' A B f
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-- The identity function is an equivalence.
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definition is_equiv_id (A : Type) : (is_equiv (id : A → A)) :=
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definition is_equiv_id [instance] (A : Type) : (is_equiv (id : A → A)) :=
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is_equiv.mk id id (λa, idp) (λa, idp) (λa, idp)
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-- The composition of two equivalences is, again, an equivalence.
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@ -218,7 +218,7 @@ namespace is_equiv
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end
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--Transporting is an equivalence
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definition is_equiv_tr [instance] [constructor] {A : Type} (P : A → Type) {x y : A}
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definition is_equiv_tr [constructor] {A : Type} (P : A → Type) {x y : A}
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(p : x = y) : (is_equiv (transport P p)) :=
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is_equiv.mk _ (transport P p⁻¹) (tr_inv_tr p) (inv_tr_tr p) (tr_inv_tr_lemma p)
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@ -245,6 +245,8 @@ end is_equiv
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open is_equiv
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namespace eq
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local attribute is_equiv_tr [instance]
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definition tr_inv_fn {A : Type} {B : A → Type} {a a' : A} (p : a = a') :
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transport B p⁻¹ = (transport B p)⁻¹ := idp
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definition tr_inv {A : Type} {B : A → Type} {a a' : A} (p : a = a') (b : B a') :
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@ -23,7 +23,7 @@ namespace is_equiv
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right_inv f b = (ap (f ∘ f⁻¹) p)⁻¹ ⬝ ((ap (f ∘ f⁻¹) p) ⬝ right_inv f b)
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: by rewrite inv_con_cancel_left
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... = (ap (f ∘ f⁻¹) p)⁻¹ ⬝ (right_inv f (f a) ⬝ p) : by rewrite ap_con_eq_con
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... = (ap (f ∘ f⁻¹) p)⁻¹ ⬝ (ap f (left_inv f a) ⬝ p) : by rewrite adj
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... = (ap (f ∘ f⁻¹) p)⁻¹ ⬝ (ap f (left_inv f a) ⬝ p) : by rewrite [adj f]
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... = (ap (f ∘ f⁻¹) p)⁻¹ ⬝ ap f (left_inv f a) ⬝ p : by rewrite con.assoc
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... = (ap f (ap f⁻¹ p))⁻¹ ⬝ ap f (left_inv f a) ⬝ p : by rewrite ap_compose
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... = ap f (ap f⁻¹ p)⁻¹ ⬝ ap f (left_inv f a) ⬝ p : by rewrite ap_inv
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