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Commit 2021-11-30 16:52 b876e76b

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feat(algebra/char_p/two): couple more lemmas + 🏌️ (#10467)

Estimated changes

Modified src/algebra/char_p/two.lean

added theorem neg_one_eq_one_iff

added theorem order_of_neg_one

Modified src/ring_theory/roots_of_unity.lean

modified theorem is_primitive_root.neg_one