typo in Properties
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@ -158,7 +158,7 @@ The appropriate instances of the inference rules are:
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(m + n) + p ≡ m + (n + p)
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---------------------------------
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(suc m + n) + p ≡ (suc m + n) + p
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(suc m + n) + p ≡ suc m + (n + p)
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If we can demonstrate both of these, then associativity of addition
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follows by induction.
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