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Using `rw [Nat.add_comm b]` should change ``a + (b + c)`` to ``a + (c + b)`` instead. See: https://live.lean-lang.org/#code=example%20(a%20b%20c%20%3A%20Nat)%20%3A%20a%20%2B%20b%20%2B%20c%20%3D%20a%20%2B%20c%20%2B%20b%20%3A%3D%20by%0A%20%20rw%20%5BNat.add_assoc%2C%20Nat.add_comm%20b%2C%20←%20Nat.add_assoc%5D
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With this patch as written, the text around the code no longer makes sense. I'll return to this one and think about the details soon - thanks for noticing! |
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Using
rw [Nat.add_comm b]should changea + (b + c)toa + (c + b)instead.See: https://live.lean-lang.org/#code=example%20(a%20b%20c%20%3A%20Nat)%20%3A%20a%20%2B%20b%20%2B%20c%20%3D%20a%20%2B%20c%20%2B%20b%20%3A%3D%20by%0A%20%20rw%20%5BNat.add_assoc%2C%20Nat.add_comm%20b%2C%20←%20Nat.add_assoc%5D