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Fix typo in tactics.md #84

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Fix typo in tactics.md #84

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2 changes: 1 addition & 1 deletion tactics.md
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Original file line number Diff line number Diff line change
Expand Up @@ -1098,7 +1098,7 @@ example (a b c : Nat) : a + b + c = a + c + b := by
In the first example above, the first step rewrites ``a + b + c`` to
``a + (b + c)``. The next step applies commutativity to the term
``b + c``; without specifying the argument, the tactic would instead rewrite
``a + (b + c)`` to ``(b + c) + a``. Finally, the last step applies
``a + (b + c)`` to ``a + (c + b)``. Finally, the last step applies
associativity in the reverse direction, rewriting ``a + (c + b)`` to
``a + c + b``. The next two examples instead apply associativity to
move the parenthesis to the right on both sides, and then switch ``b``
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