[Merged by Bors] - feat(algebra/big_operators): add commute.*_sum_{left,right} lemmas
#13035
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These live in their respective namespaces for now to match `list.prod_commute` and `multiset.prod_commute`. This also renames the existing additive versions to `sum_add_commute`, to avoid confusion.
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…13035) This moves the existing `prod_commute` lemmas into the `commute` namespace for discoverabiliy, and adds the swapped variants. This also fixes an issue where lemmas about `add_commute` were misnamed using `commute`.
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commute.*_sum_{left,right} lemmascommute.*_sum_{left,right} lemmas
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…13035) This moves the existing `prod_commute` lemmas into the `commute` namespace for discoverabiliy, and adds the swapped variants. This also fixes an issue where lemmas about `add_commute` were misnamed using `commute`.
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…13035) This moves the existing `prod_commute` lemmas into the `commute` namespace for discoverabiliy, and adds the swapped variants. This also fixes an issue where lemmas about `add_commute` were misnamed using `commute`.
jjaassoonn
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…13035) This moves the existing `prod_commute` lemmas into the `commute` namespace for discoverabiliy, and adds the swapped variants. This also fixes an issue where lemmas about `add_commute` were misnamed using `commute`.
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This moves the existing
prod_commutelemmas into thecommutenamespace for discoverabiliy, and adds the swapped variants.This also fixes an issue where lemmas about
add_commutewere misnamed usingcommute.