67 lines
2 KiB
Text
67 lines
2 KiB
Text
-- Authors: Floris van Doorn
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import homotopy.wedge
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open wedge pushout eq prod sum pointed equiv is_equiv unit lift
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namespace wedge
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definition wedge_flip [unfold 3] {A B : Type*} (x : A ∨ B) : B ∨ A :=
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begin
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induction x,
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{ exact inr a },
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{ exact inl a },
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{ exact (glue ⋆)⁻¹ }
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end
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-- TODO: fix precedences
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definition pwedge_flip [constructor] (A B : Type*) : (A ∨ B) →* (B ∨ A) :=
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pmap.mk wedge_flip (glue ⋆)⁻¹
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definition wedge_flip_wedge_flip {A B : Type*} (x : A ∨ B) : wedge_flip (wedge_flip x) = x :=
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begin
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induction x,
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{ reflexivity },
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{ reflexivity },
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{ apply eq_pathover_id_right,
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apply hdeg_square,
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exact ap_compose wedge_flip _ _ ⬝ ap02 _ !elim_glue ⬝ !ap_inv ⬝ !elim_glue⁻² ⬝ !inv_inv }
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end
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definition pwedge_comm [constructor] (A B : Type*) : A ∨ B ≃* B ∨ A :=
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begin
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fapply pequiv.MK',
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{ exact pwedge_flip A B },
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{ exact wedge_flip },
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{ exact wedge_flip_wedge_flip },
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{ exact wedge_flip_wedge_flip }
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end
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-- TODO: wedge is associative
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definition wedge_shift [unfold 3] {A B C : Type*} (x : (A ∨ B) ∨ C) : (A ∨ (B ∨ C)) :=
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begin
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induction x with l,
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induction l with a,
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exact inl a,
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exact inr (inl a),
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exact (glue ⋆),
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exact inr (inr a),
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-- exact elim_glue _ _ _,
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exact sorry
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end
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definition pwedge_pequiv [constructor] {A A' B B' : Type*} (a : A ≃* A') (b : B ≃* B') : A ∨ B ≃* A' ∨ B' :=
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begin
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fapply pequiv_of_equiv,
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exact pushout.equiv !pconst !pconst !pconst !pconst !pequiv.refl a b (λdummy, respect_pt a) (λdummy, respect_pt b),
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exact ap pushout.inl (respect_pt a)
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end
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definition plift_pwedge.{u v} (A B : Type*) : plift.{u v} (A ∨ B) ≃* plift.{u v} A ∨ plift.{u v} B :=
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calc plift.{u v} (A ∨ B) ≃* A ∨ B : by exact !pequiv_plift⁻¹ᵉ*
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... ≃* plift.{u v} A ∨ plift.{u v} B : by exact pwedge_pequiv !pequiv_plift !pequiv_plift
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end wedge
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