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exact_couple

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This commit is contained in:
Steve Awodey 2017-05-11 15:09:24 -04:00
parent de08cf57d1
commit 0b1d4428b3
1 changed files with 2 additions and 2 deletions
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algebra/exact_couple.hlean
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@ -37,8 +37,8 @@ definition homology_ugly {B : AbGroup} (d : B →g B) (H : is_differential d) :
definition homology_iso_ugly {B : AbGroup} (d : B →g B) (H : is_differential d) : (homology d H) ≃g (homology_ugly d H) :=
begin
-- fapply quotientgroupiso ...
exact sorry
fapply @iso_of_ab_qg_group (ab_kernel d) (image_subgroup (ab_subgroup_of_subgroup_incl (diff_im_in_ker d H))) (image_subgroup_of_diff d H),
end
definition SES_iso_C {A B C C' : AbGroup} (ses : SES A B C) (k : C ≃g C') : SES A B C' :=