mathlib4
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chore(Algebra.Ring.InjSurj): remove redundant `mul` and `add` fields
Lean can figure these out and if inferred instance of Mul (or Add) contains non-reducible terms, it will block unification.
- [ ] depends on: #11521
This PR/issue depends on:
- leanprover-community/mathlib4#11521 By Dependent Issues (🤖). Happy coding!