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1 That is, two pairs of terms （e.g. 1, 3; 7, 9）, of which the second term exceeds the first by the same amount as the fourth exceeds the third. We do not call this a proportion at all, but, if also the third term exceeds the second by the same amount （e.g. 1, 3, 5, 7）, an arithmetical progression.
2 For Corrective Justice the merits of the parties are immaterial.