move some files around, create folder cohomology

algebra/arrow_group.hlean

@@ -7,7 +7,7 @@ Various groups of maps. Most importantly we define a group structure
 on trunc 0 (A →* Ω B), which is used in the definition of cohomology.
 -/
 
-import algebra.group_theory ..pointed ..pointed_pi eq2 homotopy.susp
+import algebra.group_theory ..pointed ..pointed_pi eq2
 open pi pointed algebra group eq equiv is_trunc trunc susp
 namespace group
 

cohomology/basic.hlean

@@ -6,7 +6,7 @@ Authors: Floris van Doorn, Ulrik Buchholtz
 Reduced cohomology of spectra and cohomology theories
 -/
 
-import .spectrum ..algebra.arrow_group .fwedge ..choice .pushout ..algebra.product_group
+import ..homotopy.spectrum ..algebra.arrow_group homotopy.fwedge ..choice ..homotopy.pushout ..algebra.product_group
 
 open eq spectrum int trunc pointed EM group algebra circle sphere nat EM.ops equiv susp is_trunc
      function fwedge cofiber bool lift sigma is_equiv choice pushout algebra unit pi

cohomology/cofiber_sequence.hlean

@@ -6,7 +6,7 @@ Authors: Floris van Doorn
 Cofiber sequence of a pointed map
 -/
 
-import .cohomology .pushout
+import .basic ..homotopy.pushout
 
 open pointed eq cohomology sigma sigma.ops fiber cofiber chain_complex nat succ_str algebra prod group pushout int
 

cohomology/serre.hlean

@@ -1,4 +1,4 @@
-import ..algebra.spectral_sequence .strunc .cohomology
+import ..algebra.spectral_sequence ..homotopy.strunc .basic
 
 open eq spectrum trunc is_trunc pointed int EM algebra left_module fiber lift equiv is_equiv
      cohomology group sigma unit is_conn

heq.hlean

@@ -1,3 +1,4 @@
+-- Author: Floris van Doorn
 
 open eq is_trunc
 

homology/sphere.hlean

@@ -5,7 +5,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Author: Kuen-Bang Hou (Favonia)
 -/
 
-import .homology
+import .basic
 
 open eq pointed group algebra circle sphere nat equiv susp
      function sphere homology int lift

homology/torus.hlean

@@ -5,7 +5,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Author: Kuen-Bang Hou (Favonia)
 -/
 
-import .homology .sphere ..susp_product
+import .basic .sphere ..homotopy.susp_product
 
 open eq pointed group algebra circle sphere nat equiv susp
      function sphere homology int lift prod smash

homotopy/susp_product.hlean

@@ -1,4 +1,4 @@
-import core
+import homotopy.susp homotopy.smash
 open susp smash pointed wedge prod
 
 definition susp_product (X Y : Type*) : ⅀ (X × Y) ≃* ⅀ X ∨ (⅀ Y ∨ ⅀ (X ∧ Y)) :=