[Merged by Bors] - feat(algebra/*/opposite): Missing instances #18602
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A few missing instances about `nat.cast`/`int.cast`/`rat.cast` and `mul_opposite`/`add_opposite`. Also add the (weirdly) missing `add_comm_group_with_one → add_comm_monoid_with_one`. Finally, this changes the defeq of `rat.cast` on `mul_opposite` to be simpler.
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A few missing instances about `nat.cast`/`int.cast`/`rat.cast` and `mul_opposite`/`add_opposite`. Also add the (weirdly) missing `add_comm_group_with_one → add_comm_monoid_with_one`. Finally, this changes the defeq of `rat.cast` on `mul_opposite` to be simpler.
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Match leanprover-community/mathlib#18602 Co-authored-by: Eric Wieser <wieser.eric@gmail.com>
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A few missing instances about
nat.cast/int.cast/rat.castandmul_opposite/add_opposite.Also add the (weirdly) missing
add_comm_group_with_one → add_comm_monoid_with_one.Finally, this changes the defeq of
rat.castonmul_oppositeto be simpler.Match leanprover-community/mathlib4#2940