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refactor(group_theory/free_abelian_group): Make proofs more robust (#…
…14089) Reduce the API breakage by proving `distrib (free_abelian_group α)` and `has_distrib_neg (free_abelian_group α)` earlier. Protect lemmas to avoid shadowing the root ones. Co-authored-by: Kevin Buzzard <k.buzzard@imperial.ac.uk>
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