chore: use ≠ in Fin.ne_of_val_ne
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Instead of a `Not (Eq …)` term use the proper `≠` in `Fin.ne_of_val_ne`, to make it symmetric with `Fin.val_ne_of_ne`, and move the former to the same place as the latter. This answers a query of @eric-weiser at leanprover-community/mathlib4#15762 (comment)
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Instead of a
Not (Eq …)term use the proper≠inFin.ne_of_val_ne, to make it symmetric withFin.val_ne_of_ne, and move the former to the same place as the latter.This answers a query of @eric-wieser at
leanprover-community/mathlib4#15762 (comment)