Remove strange line break
Remove a strange line break in the middle of the formula. I guess the mark-down respects that line break because it's part of the formula.
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@ -656,8 +656,8 @@ time we are concerned with judgments asserting associativity:
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Now, we apply the rules to all the judgments we know about. The base
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case tells us that `(zero + n) + p ≡ zero + (n + p)` for every natural
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`n` and `p`. The inductive case tells us that if `(m + n) + p ≡ m +
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(n + p)` (on the day before today) then
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`n` and `p`. The inductive case tells us that if
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`(m + n) + p ≡ m + (n + p)` (on the day before today) then
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`(suc m + n) + p ≡ suc m + (n + p)` (today).
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We didn't know any judgments about associativity before today, so that
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rule doesn't give us any new judgments:
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