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Generalise limit.lift_self_id etc to cones. #7

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EdAyers opened this issue Feb 19, 2020 · 1 comment
Open

Generalise limit.lift_self_id etc to cones. #7

EdAyers opened this issue Feb 19, 2020 · 1 comment
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@b-mehta
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good first issue Good for newcomers

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@EdAyers
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EdAyers commented Feb 19, 2020

  • limit.lift_self_id
  • pullback.lift_self_id
  • pullback.with_id_l
  • pullback.comp_l it's a corol of Bhavik's pasting lemma
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b-mehta commented Feb 19, 2020

For with_id_l, here's what the type could look like

lemma pullback.with_id_l' {X Y : C} (f : X ⟶ Y) :
  is_limit (pullback_cone.mk f (𝟙 X) (show f ≫ (𝟙 Y) = (𝟙 X) ≫ f, by simp)) :=

@b-mehta b-mehta added the good first issue Good for newcomers label Feb 19, 2020
b-mehta added a commit that referenced this issue Feb 19, 2020
@b-mehta
start fixing #7
3e2a058
@b-mehta b-mehta mentioned this issue Feb 19, 2020
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b-mehta added a commit that referenced this issue Feb 21, 2020
@b-mehta
pullback symmetry helps in (#7) (#11)
746b201
@b-mehta b-mehta self-assigned this Feb 21, 2020
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