362 lines
16 KiB
Text
362 lines
16 KiB
Text
/-
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Copyright (c) 2016 Floris van Doorn. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Authors: Floris van Doorn
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Reduced cohomology of spectra and cohomology theories
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-/
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import .spectrum ..algebra.arrow_group .fwedge ..choice .pushout ..algebra.product_group
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open eq spectrum int trunc pointed EM group algebra circle sphere nat EM.ops equiv susp is_trunc
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function fwedge cofiber bool lift sigma is_equiv choice pushout algebra unit pi
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namespace cohomology
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/- The cohomology of X with coefficients in Y is
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trunc 0 (A →* Ω[2] (Y (n+2)))
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In the file arrow_group (in algebra) we construct the group structure on this type.
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-/
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definition cohomology (X : Type*) (Y : spectrum) (n : ℤ) : AbGroup :=
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AbGroup_trunc_pmap X (Y (n+2))
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definition ordinary_cohomology [reducible] (X : Type*) (G : AbGroup) (n : ℤ) : AbGroup :=
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cohomology X (EM_spectrum G) n
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definition ordinary_cohomology_Z [reducible] (X : Type*) (n : ℤ) : AbGroup :=
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ordinary_cohomology X agℤ n
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definition unreduced_cohomology (X : Type) (Y : spectrum) (n : ℤ) : AbGroup :=
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cohomology X₊ Y n
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definition unreduced_ordinary_cohomology [reducible] (X : Type) (G : AbGroup) (n : ℤ) : AbGroup :=
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unreduced_cohomology X (EM_spectrum G) n
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definition unreduced_ordinary_cohomology_Z [reducible] (X : Type) (n : ℤ) : AbGroup :=
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unreduced_ordinary_cohomology X agℤ n
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definition parametrized_cohomology {X : Type*} (Y : X → spectrum) (n : ℤ) : AbGroup :=
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AbGroup_trunc_ppi (λx, Y x (n+2))
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definition ordinary_parametrized_cohomology [reducible] {X : Type*} (G : X → AbGroup) (n : ℤ) :
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AbGroup :=
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parametrized_cohomology (λx, EM_spectrum (G x)) n
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definition unreduced_parametrized_cohomology {X : Type} (Y : X → spectrum) (n : ℤ) : AbGroup :=
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parametrized_cohomology (add_point_spectrum Y) n
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definition unreduced_ordinary_parametrized_cohomology [reducible] {X : Type} (G : X → AbGroup)
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(n : ℤ) : AbGroup :=
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unreduced_parametrized_cohomology (λx, EM_spectrum (G x)) n
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notation `H^` n `[`:0 X:0 `, ` Y:0 `]`:0 := cohomology X Y n
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notation `oH^` n `[`:0 X:0 `, ` G:0 `]`:0 := ordinary_cohomology X G n
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notation `H^` n `[`:0 X:0 `]`:0 := ordinary_cohomology_Z X n
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notation `uH^` n `[`:0 X:0 `, ` Y:0 `]`:0 := unreduced_cohomology X Y n
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notation `uoH^` n `[`:0 X:0 `, ` G:0 `]`:0 := unreduced_ordinary_cohomology X G n
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notation `uH^` n `[`:0 X:0 `]`:0 := unreduced_ordinary_cohomology_Z X n
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notation `pH^` n `[`:0 binders `, ` r:(scoped Y, parametrized_cohomology Y n) `]`:0 := r
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notation `opH^` n `[`:0 binders `, ` r:(scoped G, ordinary_parametrized_cohomology G n) `]`:0 := r
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notation `upH^` n `[`:0 binders `, ` r:(scoped Y, unreduced_parametrized_cohomology Y n) `]`:0 := r
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notation `uopH^` n `[`:0 binders `, ` r:(scoped G, unreduced_ordinary_parametrized_cohomology G n) `]`:0 := r
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-- check H^3[S¹*,EM_spectrum agℤ]
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-- check H^3[S¹*]
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-- check pH^3[(x : S¹*), EM_spectrum agℤ]
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/- an alternate definition of cohomology -/
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definition cohomology_equiv_shomotopy_group_sp_cotensor (X : Type*) (Y : spectrum) (n : ℤ) :
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H^n[X, Y] ≃ πₛ[-n] (sp_cotensor X Y) :=
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trunc_equiv_trunc 0 (!pfunext ⬝e loop_pequiv_loop !pfunext ⬝e loopn_pequiv_loopn 2
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(pequiv_of_eq (ap (λn, ppmap X (Y n)) (add.comm n 2 ⬝ ap (add 2) !neg_neg⁻¹))))
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definition cohomology_isomorphism_shomotopy_group_sp_cotensor (X : Type*) (Y : spectrum) {n m : ℤ}
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(p : -m = n) : H^n[X, Y] ≃g πₛ[m] (sp_cotensor X Y) :=
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sorry /- TODO FOR SSS -/
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definition unreduced_cohomology_isomorphism_shomotopy_group_sp_ucotensor (X : Type) (Y : spectrum)
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{n m : ℤ} (p : -m = n) : uH^n[X, Y] ≃g πₛ[m] (sp_ucotensor X Y) :=
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sorry /- TODO FOR SSS -/
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definition parametrized_cohomology_isomorphism_shomotopy_group_spi {X : Type*} (Y : X → spectrum)
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{n m : ℤ} (p : -m = n) : pH^n[(x : X), Y x] ≃g πₛ[m] (spi X Y) :=
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begin
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apply isomorphism.trans (trunc_ppi_loop_isomorphism (λx, Ω (Y x (n + 2))))⁻¹ᵍ,
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apply homotopy_group_isomorphism_of_pequiv 0, esimp,
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have q : sub 2 m = n + 2,
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from (int.add_comm (of_nat 2) (-m) ⬝ ap (λk, k + of_nat 2) p),
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rewrite q, symmetry, apply ppi_loop_pequiv
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end
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definition unreduced_parametrized_cohomology_isomorphism_shomotopy_group_supi {X : Type}
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(Y : X → spectrum) {n m : ℤ} (p : -m = n) : upH^n[(x : X), Y x] ≃g πₛ[m] (supi X Y) :=
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sorry /- TODO FOR SSS -/
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/- functoriality -/
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definition cohomology_functor [constructor] {X X' : Type*} (f : X' →* X) (Y : spectrum)
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(n : ℤ) : cohomology X Y n →g cohomology X' Y n :=
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Group_trunc_pmap_homomorphism f
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definition cohomology_functor_pid (X : Type*) (Y : spectrum) (n : ℤ) (f : H^n[X, Y]) :
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cohomology_functor (pid X) Y n f = f :=
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!Group_trunc_pmap_pid
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definition cohomology_functor_pcompose {X X' X'' : Type*} (f : X' →* X) (g : X'' →* X')
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(Y : spectrum) (n : ℤ) (h : H^n[X, Y]) : cohomology_functor (f ∘* g) Y n h =
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cohomology_functor g Y n (cohomology_functor f Y n h) :=
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!Group_trunc_pmap_pcompose
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definition cohomology_functor_phomotopy {X X' : Type*} {f g : X' →* X} (p : f ~* g)
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(Y : spectrum) (n : ℤ) : cohomology_functor f Y n ~ cohomology_functor g Y n :=
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Group_trunc_pmap_phomotopy p
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definition cohomology_functor_phomotopy_refl {X X' : Type*} (f : X' →* X) (Y : spectrum) (n : ℤ)
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(x : H^n[X, Y]) : cohomology_functor_phomotopy (phomotopy.refl f) Y n x = idp :=
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Group_trunc_pmap_phomotopy_refl f x
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definition cohomology_functor_pconst {X X' : Type*} (Y : spectrum) (n : ℤ) (f : H^n[X, Y]) :
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cohomology_functor (pconst X' X) Y n f = 1 :=
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!Group_trunc_pmap_pconst
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definition cohomology_isomorphism {X X' : Type*} (f : X' ≃* X) (Y : spectrum) (n : ℤ) :
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H^n[X, Y] ≃g H^n[X', Y] :=
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Group_trunc_pmap_isomorphism f
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definition cohomology_isomorphism_refl (X : Type*) (Y : spectrum) (n : ℤ) (x : H^n[X,Y]) :
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cohomology_isomorphism (pequiv.refl X) Y n x = x :=
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!Group_trunc_pmap_isomorphism_refl
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definition cohomology_isomorphism_right (X : Type*) {Y Y' : spectrum} (e : Πn, Y n ≃* Y' n)
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(n : ℤ) : H^n[X, Y] ≃g H^n[X, Y'] :=
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sorry /- TODO FOR SSS -/
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definition parametrized_cohomology_isomorphism_right {X : Type*} {Y Y' : X → spectrum}
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(e : Πx n, Y x n ≃* Y' x n) (n : ℤ) : pH^n[(x : X), Y x] ≃g pH^n[(x : X), Y' x] :=
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sorry /- TODO FOR SSS -/
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definition unreduced_parametrized_cohomology_isomorphism_right {X : Type} {Y Y' : X → spectrum}
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(e : Πx n, Y x n ≃* Y' x n) (n : ℤ) : upH^n[(x : X), Y x] ≃g upH^n[(x : X), Y' x] :=
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sorry /- TODO FOR SSS -/
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definition unreduced_ordinary_parametrized_cohomology_isomorphism_right {X : Type}
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{G G' : X → AbGroup} (e : Πx, G x ≃g G' x) (n : ℤ) :
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uopH^n[(x : X), G x] ≃g uopH^n[(x : X), G' x] :=
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sorry /- TODO FOR SSS -/
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definition ordinary_cohomology_isomorphism_right (X : Type*) {G G' : AbGroup} (e : G ≃g G')
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(n : ℤ) : oH^n[X, G] ≃g oH^n[X, G'] :=
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cohomology_isomorphism_right X (EM_spectrum_pequiv e) n
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definition ordinary_parametrized_cohomology_isomorphism_right {X : Type*} {G G' : X → AbGroup}
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(e : Πx, G x ≃g G' x) (n : ℤ) : opH^n[(x : X), G x] ≃g opH^n[(x : X), G' x] :=
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parametrized_cohomology_isomorphism_right (λx, EM_spectrum_pequiv (e x)) n
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definition uopH_isomorphism_opH {X : Type} (G : X → AbGroup) (n : ℤ) :
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uopH^n[(x : X), G x] ≃g opH^n[(x : X₊), add_point_AbGroup G x] :=
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parametrized_cohomology_isomorphism_right
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begin
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intro x n, induction x with x,
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{ symmetry, apply EM_spectrum_trivial, },
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{ reflexivity }
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end
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n
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/- suspension axiom -/
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definition cohomology_psusp_2 (Y : spectrum) (n : ℤ) :
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Ω (Ω[2] (Y ((n+1)+2))) ≃* Ω[2] (Y (n+2)) :=
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begin
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apply loopn_pequiv_loopn 2,
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exact loop_pequiv_loop (pequiv_of_eq (ap Y (add.right_comm n 1 2))) ⬝e* !equiv_glue⁻¹ᵉ*
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end
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definition cohomology_psusp_1 (X : Type*) (Y : spectrum) (n : ℤ) :
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psusp X →* Ω (Ω (Y (n + 1 + 2))) ≃ X →* Ω (Ω (Y (n+2))) :=
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calc
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psusp X →* Ω[2] (Y (n + 1 + 2)) ≃ X →* Ω (Ω[2] (Y (n + 1 + 2))) : psusp_adjoint_loop_unpointed
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... ≃ X →* Ω[2] (Y (n+2)) : equiv_of_pequiv (pequiv_ppcompose_left
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(cohomology_psusp_2 Y n))
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definition cohomology_psusp_1_pmap_mul {X : Type*} {Y : spectrum} {n : ℤ}
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(f g : psusp X →* Ω (Ω (Y (n + 1 + 2)))) : cohomology_psusp_1 X Y n (pmap_mul f g) ~*
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pmap_mul (cohomology_psusp_1 X Y n f) (cohomology_psusp_1 X Y n g) :=
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begin
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unfold [cohomology_psusp_1],
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refine pwhisker_left _ !loop_psusp_intro_pmap_mul ⬝* _,
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apply pcompose_pmap_mul
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end
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definition cohomology_psusp_equiv (X : Type*) (Y : spectrum) (n : ℤ) :
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H^n+1[psusp X, Y] ≃ H^n[X, Y] :=
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trunc_equiv_trunc _ (cohomology_psusp_1 X Y n)
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definition cohomology_psusp (X : Type*) (Y : spectrum) (n : ℤ) :
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H^n+1[psusp X, Y] ≃g H^n[X, Y] :=
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isomorphism_of_equiv (cohomology_psusp_equiv X Y n)
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begin
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intro f₁ f₂, induction f₁ with f₁, induction f₂ with f₂,
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apply ap tr, apply eq_of_phomotopy, exact cohomology_psusp_1_pmap_mul f₁ f₂
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end
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definition cohomology_psusp_natural {X X' : Type*} (f : X →* X') (Y : spectrum) (n : ℤ) :
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cohomology_psusp X Y n ∘ cohomology_functor (psusp_functor f) Y (n+1) ~
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cohomology_functor f Y n ∘ cohomology_psusp X' Y n :=
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begin
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refine (trunc_functor_compose _ _ _)⁻¹ʰᵗʸ ⬝hty _ ⬝hty trunc_functor_compose _ _ _,
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apply trunc_functor_homotopy, intro g,
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apply eq_of_phomotopy, refine _ ⬝* !passoc⁻¹*, apply pwhisker_left,
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apply loop_psusp_intro_natural
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end
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/- exactness -/
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definition cohomology_exact {X X' : Type*} (f : X →* X') (Y : spectrum) (n : ℤ) :
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is_exact_g (cohomology_functor (pcod f) Y n) (cohomology_functor f Y n) :=
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is_exact_trunc_functor (cofiber_exact f)
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/- additivity -/
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definition additive_hom [constructor] {I : Type} (X : I → Type*) (Y : spectrum) (n : ℤ) :
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H^n[⋁X, Y] →g Πᵍ i, H^n[X i, Y] :=
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Group_pi_intro (λi, cohomology_functor (pinl i) Y n)
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definition additive_equiv.{u} {I : Type.{u}} (H : has_choice 0 I) (X : I → Type*) (Y : spectrum)
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(n : ℤ) : H^n[⋁X, Y] ≃ Πᵍ i, H^n[X i, Y] :=
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trunc_fwedge_pmap_equiv H X (Ω[2] (Y (n+2)))
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definition spectrum_additive {I : Type} (H : has_choice 0 I) (X : I → Type*) (Y : spectrum)
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(n : ℤ) : is_equiv (additive_hom X Y n) :=
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is_equiv_of_equiv_of_homotopy (additive_equiv H X Y n) begin intro f, induction f, reflexivity end
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/- dimension axiom for ordinary cohomology -/
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open is_conn trunc_index
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theorem EM_dimension' (G : AbGroup) (n : ℤ) (H : n ≠ 0) :
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is_contr (ordinary_cohomology pbool G n) :=
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begin
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apply is_conn_equiv_closed 0 !pmap_pbool_equiv⁻¹ᵉ,
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apply is_conn_equiv_closed 0 !equiv_glue2⁻¹ᵉ,
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cases n with n n,
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{ cases n with n,
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{ exfalso, apply H, reflexivity },
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{ apply is_conn_of_le, apply zero_le_of_nat n, exact is_conn_EMadd1 G n, }},
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{ apply is_trunc_trunc_of_is_trunc, apply @is_contr_loop_of_is_trunc (n+1) (K G 0),
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apply is_trunc_of_le _ (zero_le_of_nat n) }
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end
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theorem EM_dimension (G : AbGroup) (n : ℤ) (H : n ≠ 0) :
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is_contr (ordinary_cohomology (plift pbool) G n) :=
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@(is_trunc_equiv_closed_rev -2
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(equiv_of_isomorphism (cohomology_isomorphism (pequiv_plift pbool) _ _)))
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(EM_dimension' G n H)
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open group algebra
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theorem ordinary_cohomology_pbool (G : AbGroup) : ordinary_cohomology pbool G 0 ≃g G :=
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sorry
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--isomorphism_of_equiv (trunc_equiv_trunc 0 (ppmap_pbool_pequiv _ ⬝e _) ⬝e !trunc_equiv) sorry
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/- cohomology theory -/
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structure cohomology_theory.{u} : Type.{u+1} :=
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(HH : ℤ → pType.{u} → AbGroup.{u})
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(Hiso : Π(n : ℤ) {X Y : Type*} (f : X ≃* Y), HH n Y ≃g HH n X)
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(Hiso_refl : Π(n : ℤ) (X : Type*) (x : HH n X), Hiso n pequiv.rfl x = x)
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(Hh : Π(n : ℤ) {X Y : Type*} (f : X →* Y), HH n Y →g HH n X)
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(Hhomotopy : Π(n : ℤ) {X Y : Type*} {f g : X →* Y} (p : f ~* g), Hh n f ~ Hh n g)
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(Hhomotopy_refl : Π(n : ℤ) {X Y : Type*} (f : X →* Y) (x : HH n Y),
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Hhomotopy n (phomotopy.refl f) x = idp)
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(Hid : Π(n : ℤ) {X : Type*} (x : HH n X), Hh n (pid X) x = x)
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(Hcompose : Π(n : ℤ) {X Y Z : Type*} (g : Y →* Z) (f : X →* Y) (z : HH n Z),
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Hh n (g ∘* f) z = Hh n f (Hh n g z))
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(Hsusp : Π(n : ℤ) (X : Type*), HH (succ n) (psusp X) ≃g HH n X)
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(Hsusp_natural : Π(n : ℤ) {X Y : Type*} (f : X →* Y),
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Hsusp n X ∘ Hh (succ n) (psusp_functor f) ~ Hh n f ∘ Hsusp n Y)
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(Hexact : Π(n : ℤ) {X Y : Type*} (f : X →* Y), is_exact_g (Hh n (pcod f)) (Hh n f))
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(Hadditive : Π(n : ℤ) {I : Type.{u}} (X : I → Type*), has_choice 0 I →
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is_equiv (Group_pi_intro (λi, Hh n (pinl i)) : HH n (⋁ X) → Πᵍ i, HH n (X i)))
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structure ordinary_cohomology_theory.{u} extends cohomology_theory.{u} : Type.{u+1} :=
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(Hdimension : Π(n : ℤ), n ≠ 0 → is_contr (HH n (plift pbool)))
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attribute cohomology_theory.HH [coercion]
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postfix `^→`:90 := cohomology_theory.Hh
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open cohomology_theory
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definition Hequiv (H : cohomology_theory) (n : ℤ) {X Y : Type*} (f : X ≃* Y) : H n Y ≃ H n X :=
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equiv_of_isomorphism (Hiso H n f)
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definition Hsusp_neg (H : cohomology_theory) (n : ℤ) (X : Type*) : H n (psusp X) ≃g H (pred n) X :=
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isomorphism_of_eq (ap (λn, H n _) proof (sub_add_cancel n 1)⁻¹ qed) ⬝g cohomology_theory.Hsusp H (pred n) X
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definition Hsusp_neg_natural (H : cohomology_theory) (n : ℤ) {X Y : Type*} (f : X →* Y) :
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Hsusp_neg H n X ∘ H ^→ n (psusp_functor f) ~ H ^→ (pred n) f ∘ Hsusp_neg H n Y :=
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sorry
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definition Hsusp_inv_natural (H : cohomology_theory) (n : ℤ) {X Y : Type*} (f : X →* Y) :
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H ^→ (succ n) (psusp_functor f) ∘g (Hsusp H n Y)⁻¹ᵍ ~ (Hsusp H n X)⁻¹ᵍ ∘ H ^→ n f :=
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sorry
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definition Hsusp_neg_inv_natural (H : cohomology_theory) (n : ℤ) {X Y : Type*} (f : X →* Y) :
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H ^→ n (psusp_functor f) ∘g (Hsusp_neg H n Y)⁻¹ᵍ ~ (Hsusp_neg H n X)⁻¹ᵍ ∘ H ^→ (pred n) f :=
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sorry
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definition Hadditive_equiv (H : cohomology_theory) (n : ℤ) {I : Type} (X : I → Type*) (H2 : has_choice 0 I)
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: H n (⋁ X) ≃g Πᵍ i, H n (X i) :=
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isomorphism.mk _ (Hadditive H n X H2)
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definition Hlift_empty.{u} (H : cohomology_theory.{u}) (n : ℤ) :
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is_contr (H n (plift punit)) :=
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let P : lift empty → Type* := lift.rec empty.elim in
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let x := Hadditive H n P _ in
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begin
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note z := equiv.mk _ x,
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refine @(is_trunc_equiv_closed_rev -2 (_ ⬝e z ⬝e _)) !is_contr_unit,
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refine Hequiv H n (pequiv_punit_of_is_contr _ _ ⬝e* !pequiv_plift),
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apply is_contr_fwedge_of_neg, intro y, induction y with y, exact y,
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apply equiv_unit_of_is_contr, apply is_contr_pi_of_neg, intro y, induction y with y, exact y
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end
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definition Hempty (H : cohomology_theory.{0}) (n : ℤ) :
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is_contr (H n punit) :=
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@(is_trunc_equiv_closed _ (Hequiv H n !pequiv_plift)) (Hlift_empty H n)
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definition Hconst (H : cohomology_theory) (n : ℤ) {X Y : Type*} (y : H n Y) : H ^→ n (pconst X Y) y = 1 :=
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begin
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refine Hhomotopy H n (pconst_pcompose (pconst X (plift punit)))⁻¹* y ⬝ _,
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refine Hcompose H n _ _ y ⬝ _,
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refine ap (H ^→ n _) (@eq_of_is_contr _ (Hlift_empty H n) _ 1) ⬝ _,
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apply respect_one
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end
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-- definition Hwedge (H : cohomology_theory) (n : ℤ) (A B : Type*) : H n (A ∨ B) ≃g H n A ×ag H n B :=
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-- begin
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-- refine Hiso H n (pwedge_pequiv_fwedge A B)⁻¹ᵉ* ⬝g _,
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-- refine Hadditive_equiv H n _ _ ⬝g _
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-- end
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definition cohomology_theory_spectrum.{u} [constructor] (Y : spectrum.{u}) : cohomology_theory.{u} :=
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cohomology_theory.mk
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(λn A, H^n[A, Y])
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(λn A B f, cohomology_isomorphism f Y n)
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(λn A, cohomology_isomorphism_refl A Y n)
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(λn A B f, cohomology_functor f Y n)
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(λn A B f g p, cohomology_functor_phomotopy p Y n)
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(λn A B f x, cohomology_functor_phomotopy_refl f Y n x)
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(λn A x, cohomology_functor_pid A Y n x)
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(λn A B C g f x, cohomology_functor_pcompose g f Y n x)
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(λn A, cohomology_psusp A Y n)
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(λn A B f, cohomology_psusp_natural f Y n)
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(λn A B f, cohomology_exact f Y n)
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(λn I A H, spectrum_additive H A Y n)
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-- set_option pp.universes true
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-- set_option pp.abbreviations false
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-- print cohomology_theory_spectrum
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-- print EM_spectrum
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-- print has_choice_lift
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-- print equiv_lift
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-- print has_choice_equiv_closed
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definition ordinary_cohomology_theory_EM [constructor] (G : AbGroup) : ordinary_cohomology_theory :=
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⦃ordinary_cohomology_theory, cohomology_theory_spectrum (EM_spectrum G), Hdimension := EM_dimension G ⦄
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end cohomology
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