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feat(algebra/category): forgetful functors from modules/abelian groups preserve epis/monos
The corresponding reflects statements already follow from faithfulness.
- [x] depends on: #14829
- [x] depends on: #15107
This PR/issue depends on:
- ~~leanprover-community/mathlib#14829~~
- ~~leanprover-community/mathlib#15107~~ By Dependent Issues (🤖). Happy coding!
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