[Merged by Bors] - feat(category_theory/kernels): kernel_iso_of_eq #3372
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semorrison
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This provides two useful isomorphisms when working with abstract (co)kernels:
```
def kernel_zero_iso_source [has_kernel (0 : X ⟶ Y)] : kernel (0 : X ⟶ Y) ≅ X :=
def kernel_iso_of_eq {f g : X ⟶ Y} [has_kernel f] [has_kernel g] (h : f = g) : kernel f ≅ kernel g :=
```
and some associated simp lemmas.
Co-authored-by: Scott Morrison <scott.morrison@gmail.com>
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…#3372) This provides two useful isomorphisms when working with abstract (co)kernels: ``` def kernel_zero_iso_source [has_kernel (0 : X ⟶ Y)] : kernel (0 : X ⟶ Y) ≅ X := def kernel_iso_of_eq {f g : X ⟶ Y} [has_kernel f] [has_kernel g] (h : f = g) : kernel f ≅ kernel g := ``` and some associated simp lemmas. Co-authored-by: Scott Morrison <scott.morrison@gmail.com>
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This provides two useful isomorphisms when working with abstract (co)kernels:
and some associated simp lemmas.