[Merged by Bors] - feat: port Data.Matrix.PEquiv #3234
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Ruben-VandeVelde
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Apr 2, 2023
Ruben-VandeVelde
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Mathbin -> Mathlib fix certain import statements move "by" to end of line add import to Mathlib.lean
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Mathlib/Data/Matrix/PEquiv.lean
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| instance [DecidableEq n] (j : n) (o : Option n) : Decidable (j ∈ o) := by | ||
| rw [←Option.mem_toList] | ||
| infer_instance |
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This instance shouldn't need [DecidableEq n]
What instance is found in Lean3?
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option.decidable_eq
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| -- Porting note: added | ||
| local instance [DecidableEq n] (j : n) (o : Option n) : Decidable (j ∈ o) := | ||
| haveI : Decidable (o = some j) := inferInstance | ||
| this |
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This is definitely better, but belongs in the same file that defines the ∈ notation
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That's Std.Data.Option.Basic. I'll submit a PR there tomorrow, but wouldn't mind if we moved this along in the meantime.
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Co-authored-by: Jeremy Tan Jie Rui <reddeloostw@gmail.com> Co-authored-by: Chris Hughes <33847686+ChrisHughes24@users.noreply.github.com>
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Co-authored-by: Jeremy Tan Jie Rui <reddeloostw@gmail.com> Co-authored-by: Chris Hughes <33847686+ChrisHughes24@users.noreply.github.com>
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Co-authored-by: Jeremy Tan Jie Rui <reddeloostw@gmail.com> Co-authored-by: Chris Hughes <33847686+ChrisHughes24@users.noreply.github.com>
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