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Egbert Rijke 2016-12-01 14:41:36 -05:00
parent c0a6e581e6
commit de641aac71

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@ -284,7 +284,7 @@ namespace group
definition image_incl {G H : Group} (f : G →g H) : image f →g H := definition image_incl {G H : Group} (f : G →g H) : image f →g H :=
incl_of_subgroup (image_subgroup f) incl_of_subgroup (image_subgroup f)
definition comm_image_incl {A B : CommGroup} (f : A →g B) : comm_image f →g B := incl_of_subgroup (image_subgroup f) definition comm_image_incl {A B : AbGroup} (f : A →g B) : ab_image f →g B := incl_of_subgroup (image_subgroup f)
definition hom_lift {G H : Group} (f : G →g H) (K : subgroup_rel H) (Hyp : Π (g : G), K (f g)) : G →g subgroup K := definition hom_lift {G H : Group} (f : G →g H) (K : subgroup_rel H) (Hyp : Π (g : G), K (f g)) : G →g subgroup K :=
begin begin